C3 trig help
This is to do with trig identities. It's probably really simple but I'm having a mind block >< 
Thankyou!
Posted from TSR Mobile
Thankyou!
Posted from TSR Mobile
Scroll to see replies
Whenever I teach identities I encourage all students to have a sheet which:
(1) Lists all identities and subtle manipulations
(2) Methods in which to prove identities
You have some good advice in the post above.
(1) Lists all identities and subtle manipulations
(2) Methods in which to prove identities
You have some good advice in the post above.
Original post by the bear
replace tan with a well known combination of sin and cos...
I originally tried that and got an answer which is wrong.
Posted from TSR Mobile
Original post by kendellex
You didn't though
cosx/cosx = 1
Original post by kendellex
I originally tried that and got an answer which is wrong. 
What did you do after the fraction line?
Original post by kendellex
Would the last line not end up as (1+sin(2theta))/cos(2theta) ?
I just multiplied it by cosx - sinx to change it out of a fraction 
Posted from TSR Mobile
Posted from TSR Mobile
Original post by kendellex
I just multiplied it by cosx - sinx to change it out of a fraction
So where did your denominator go?
Original post by kendellex
But you haven't done that.
If I multiply the fraction 1/2 by 5 I dont get 5/10 I get 5/2.
Original post by kendellex
Have you been given the answer to the question?
1+sin theta/ 1-sin theta
then multipliying the reciprocal to the numerator
so it goes 1+sin theta (x) 1/1-sin theta
then it ended up as (1-sin theta+sin theta-sin(squared)theta)
the -sin and +sin cancels out so I was left with (1-Sin(squared)Theta) Which is cos(squared)Theta.
Is this correct? I'm doing C3 too so I need help haha
then multipliying the reciprocal to the numerator
so it goes 1+sin theta (x) 1/1-sin theta
then it ended up as (1-sin theta+sin theta-sin(squared)theta)
the -sin and +sin cancels out so I was left with (1-Sin(squared)Theta) Which is cos(squared)Theta.
Is this correct? I'm doing C3 too so I need help haha
Original post by brent_
1+sin theta/ 1-sin theta
then multipliying the reciprocal to the numerator
so it goes 1+sin theta (x) 1/1-sin theta
then it ended up as (1-sin theta+sin theta-sin(squared)theta)
the -sin and +sin cancels out so I was left with (1-Sin(squared)Theta) Which is cos(squared)Theta.
Is this correct? I'm doing C3 too so I need help haha
then multipliying the reciprocal to the numerator
so it goes 1+sin theta (x) 1/1-sin theta
then it ended up as (1-sin theta+sin theta-sin(squared)theta)
the -sin and +sin cancels out so I was left with (1-Sin(squared)Theta) Which is cos(squared)Theta.
Is this correct? I'm doing C3 too so I need help haha
where does your
Unparseable latex formula:
come from\dfrac{1+\sin \theta}{1-\sin \theta}}
Original post by TenOfThem
where does your
Unparseable latex formula:
come from\dfrac{1+\sin \theta}{1-\sin \theta}}
I evaluated 1+sin/cos
1-sin/cos
And unfortunately ended up with that.
Original post by brent_
I evaluated 1+sin/cos
1-sin/cos
And unfortunately ended up with that.
1-sin/cos
And unfortunately ended up with that.
You think that
Where did the s go
Original post by kendellex
This is to do with trig identities. It's probably really simple but I'm having a mind block ><
Thankyou!
Posted from TSR Mobile
Thankyou!
Posted from TSR Mobile
Is it not just tan(theta + 45)
expand it out using the double angle formulas remembering that tan(45) = 1
Original post by Student10011
Is it not just tan(theta + 45)
expand it out using the double angle formulas remembering that tan(45) = 1
expand it out using the double angle formulas remembering that tan(45) = 1
Yes, it is
Original post by Student10011
Is it not just tan(theta + 45)
expand it out using the double angle formulas remembering that tan(45) = 1
expand it out using the double angle formulas remembering that tan(45) = 1
Thank you! I honestly forgot that rule >< I've got it now (:
Posted from TSR Mobile
Original post by kendellex
Thank you! I honestly forgot that rule >< I've got it now (:
You may have solved this but - have you reflected on your error from earlier - do you know what you did wrong
Quick Reply
Related discussions
- Edexcel A2 Mathematics: Core Mathematics C4 6666 01 - 22 June 2018 [Exam Discussion]
- Maths Trig question
- C3 Trig question
- A Level Maths Integration
- Applied Calculus Help
- Further maths: Further Calculus
- Help urgent maths
- Help how do I get this answer maths
- AS Maths edexcel 2023
- Struggling with Year 2 pure maths
- Maths Question
- Advanced mathematics
- Help with complex summation further maths a levels
- AS level physics forces and motion question
- maths help
- edexcel maths a level
- GCSE Edexcel Maths - trigonometric ratios of angles between 0 and 360
- What topics are NOT in the non calculator paper in GCSE maths?
- Help urgently maths
- Maths A level - Trignometric proof
Latest
Trending
Last reply 1 day ago
Did Cambridge maths students find maths and further maths a level very easy?Last reply 2 weeks ago
Edexcel A Level Mathematics Paper 2 unofficial mark scheme correct me if wrongMaths
71
Trending
Last reply 1 day ago
Did Cambridge maths students find maths and further maths a level very easy?Last reply 2 weeks ago
Edexcel A Level Mathematics Paper 2 unofficial mark scheme correct me if wrongMaths
71
