# C3 Basic Trig

Watch
Announcements

tan2θcosec2θ

Simplify

I did tan2θ * 1/sin2θ = tan2θ/sin2θ

However, it is either wrong or i have not simplified far enough?

Simplify

I did tan2θ * 1/sin2θ = tan2θ/sin2θ

However, it is either wrong or i have not simplified far enough?

0

reply

(Original post by

is that tan2feta, or tan squared feta?

**DeGoldenGamer**)is that tan2feta, or tan squared feta?

0

reply

Report

#4

(Original post by

is that tan2feta, or tan squared feta?

**DeGoldenGamer**)is that tan2feta, or tan squared feta?

2

reply

Report

#5

(Original post by

tan2θcosec2θ

Simplify

I did tan2θ * 1/sin2θ = tan2θ/sin2θ

However, it is either wrong or i have not simplified far enough?

**Desultory**)tan2θcosec2θ

Simplify

I did tan2θ * 1/sin2θ = tan2θ/sin2θ

However, it is either wrong or i have not simplified far enough?

Given these are both functions of , you may be expected to use the double angle formulae to change these into expressions of just and

Give that a go and let us know what you come up with

0

reply

(Original post by

You didn't really simplify it, you just changed the cosec to a sin

Given these are both functions of , you may be expected to use the double angle formulae to change these into expressions of just and

Give that a go and let us know what you come up with

**Ed5**)You didn't really simplify it, you just changed the cosec to a sin

Given these are both functions of , you may be expected to use the double angle formulae to change these into expressions of just and

Give that a go and let us know what you come up with

0

reply

Report

#7

(Original post by

This is c3 year 13 maths? Sorry i dont know the double angle formulae

**Desultory**)This is c3 year 13 maths? Sorry i dont know the double angle formulae

You should definitely cover it in class at some point so it's likely you just haven't reached the topic yet

0

reply

Report

#8

**Desultory**)

tan2θcosec2θ

Simplify

I did tan2θ * 1/sin2θ = tan2θ/sin2θ

However, it is either wrong or i have not simplified far enough?

You don't need to use double angle formulae for this question.

0

reply

(Original post by

If you're on edexcel, aye it's C3 and these formulae are a key part of it. They let you break down trignometric functions into more basic ones, e.g.

You should definitely cover it in class at some point so it's likely you just haven't reached the topic yet

**Ed5**)If you're on edexcel, aye it's C3 and these formulae are a key part of it. They let you break down trignometric functions into more basic ones, e.g.

You should definitely cover it in class at some point so it's likely you just haven't reached the topic yet

0

reply

(Original post by

Write and see what you notice.

You don't need to use double angle formulae for this question.

**Notnek**)Write and see what you notice.

You don't need to use double angle formulae for this question.

I didnt know that?

0

reply

Report

#11

(Original post by

i know tan theta = sin theta / cos theta but if its tan 2 theta, are you allowed to put a 2 infront of the sin and cos theta?

I didnt know that?

**Desultory**)i know tan theta = sin theta / cos theta but if its tan 2 theta, are you allowed to put a 2 infront of the sin and cos theta?

I didnt know that?

E.g.

or

0

reply

Report

#12

(Original post by

That is true but this is a section 6 question which is basic trig not section 7 which is further trig so i am not expexted to use that so i need another way?

**Desultory**)That is true but this is a section 6 question which is basic trig not section 7 which is further trig so i am not expexted to use that so i need another way?

**Notnek**)

Write and see what you notice.

You don't need to use double angle formulae for this question.

0

reply

(Original post by

Yes, the identity is () and since it's an identity, it's true for all so you can replace with anything.

E.g.

or

**Notnek**)Yes, the identity is () and since it's an identity, it's true for all so you can replace with anything.

E.g.

or

However, if there is a question where its tan^2 theta, can that equal sin^2 theta / cos ^2 theta or not?

0

reply

(Original post by

Must just be like this then. I wasn't really sure given you didn't mention the module, and 'simplify' can be quite open ended

**Ed5**)Must just be like this then. I wasn't really sure given you didn't mention the module, and 'simplify' can be quite open ended

I appreciated the advice!

0

reply

Report

#15

(Original post by

Okay that makes sense thanks i worked it out now

However, if there is a question where its tan^2 theta, can that equal sin^2 theta / cos ^2 theta or not?

**Desultory**)Okay that makes sense thanks i worked it out now

However, if there is a question where its tan^2 theta, can that equal sin^2 theta / cos ^2 theta or not?

0

reply

1

reply

Report

#17

(Original post by

Okay thanks now these questions seem easy!

**Desultory**)Okay thanks now these questions seem easy!

When a student tells me that they hate C3 trig (common), I know that they probably haven't practiced enough

0

reply

(Original post by

Getting good at C3/4 trigonometry is all about practice. Some students think they can get by if they just learn the identities but this doesn't work. You have to try as many different questions as you can to see how/where identities can be used and to pick up all the little tricks.

When a student tells me that they hate C3 trig (common), I know that they probably haven't practiced enough

**Notnek**)Getting good at C3/4 trigonometry is all about practice. Some students think they can get by if they just learn the identities but this doesn't work. You have to try as many different questions as you can to see how/where identities can be used and to pick up all the little tricks.

When a student tells me that they hate C3 trig (common), I know that they probably haven't practiced enough

are you a teacher of maths?

reccommend any good websites for tutors or even yourself?

0

reply

Report

#19

(Original post by

haha i completely understand

are you a teacher of maths?

reccommend any good websites for tutors or even yourself?

**Desultory**)haha i completely understand

are you a teacher of maths?

reccommend any good websites for tutors or even yourself?

0

reply

(Original post by

Yes I teach/tutor. If you google "maths tutor" then you'll find websites where you can find tutors near you.

**Notnek**)Yes I teach/tutor. If you google "maths tutor" then you'll find websites where you can find tutors near you.

sec A - sec A * sin^2 A

i did 1/cos A - 1/cos A * 1-cos^2A) but it doesnt really simplify

have i done this wrong?

0

reply

X

### Quick Reply

Back

to top

to top