Edexcel Core 3 - 21st June 2016 AM

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Original post by nishofficial

How did you prove it was cotx?

As far as I remember, in the end you get (1-sin^2x)/sinxcosx = cos^x/sinxcosx = cotx

the questions for all the 'easy' topics weren't all that easy this time like even that fraction question was tricky (q7?)

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there is a sign change, you needed to create a new function f(x) that was g(x) take away the equation of the second line

What a shitshow

How did every express 2 cos theta - sin theta in the form R cos (theta + a) ?

mixed feelings about that one, don't think I will have got the A that I needed

What the **** was that?!! Lmao

Original post by nishofficial

How did you prove it was cotx?

Change tan and cots into sin and cos

LOVED IT! (except for some dodgy bits in the last question) will arsey be doing model answers this year?

Original post by timelizard

goodbye to that A* I had hoped for

sameeee

Original post by Dark knight123

They never have done 3 marks difference between grade C and B always been six or seven.

You're right, corrected now.

I didn't even complete some questions :frown:

:frown:

worst paper I've ever done for sure!!

why was there a question about partial fractions lol

Original post by mpwb12345

How did every express 2 cos theta - sin theta in the form R cos (theta + a) ?

R=root5
Theta = 26.57

I can happily kiss goodbye to my uni offer hardest paper I've ever seen didn't do like 20 marks :frown:

:frown:

(((

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Original post by mpwb12345

How did every express 2 cos theta - sin theta in the form R cos (theta + a) ?

Was root 5 and 26.somethon

this is the correct method

The last question was almost an exact repeat of one that's been up before, otherwise I wouldn't have been able to do it lol

Original post by nishofficial

How did you prove it was cotx?

I used the cos^2(x)-sin^2(x) identity for cos2x, then used a common denominator of 2sin^2(x)cos(x), it all ended up collapsing in itself to get cosx/sinx

Kevin De Bruyne

http://www.thestudentroom.co.uk/showthread.php?t=4117437

Original post by tayloryeah

LOVED IT! (except for some dodgy bits in the last question) will arsey be doing model answers this year?

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