# INTEGRATION A LEVEL MATHS PURE Help!

Thread starter 1 year ago
#1
How would you integrate
sin3xcos2x
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Thread starter 1 year ago
#2
To make it this form
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1 year ago
#3
Sum identity
https://www.purplemath.com/modules/idents.htm
1
Thread starter 1 year ago
#4
Can you elaborate further please as Im unsure what do substitute in
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1 year ago
#5
(Original post by joke123132)
To make it this form
sorry I'm just wondering, which textbook is that from?
Last edited by username3477548; 1 year ago
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1 year ago
#6
(Original post by joke123132)
Can you elaborate further please as Im unsure what do substitute in
Have you looked at the sum identity in the link? Have a go at matching the relevant one.
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1 year ago
#7
use sin(A+B)=sin(A)cos(B)+cos(A)sin(B)
sin(A-B)=sin(A)cos(B)-cos(A)sin(B)
A=3X, B=2X
GOOD LUCK
Last edited by achieve526kk; 1 year ago
2
Thread starter 1 year ago
#8
(Original post by Qxi.xli)
sorry I'm just wondering, which textbook is that from?
edexcel year 2 pure
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Thread starter 1 year ago
#9
(Original post by achieve526kk)
use sin(A+B)=sin(A)cos(B)+cos(A)sin(B)
sin(A-B)=sin(A)cos(B)-cos(A)sin(B)
A=3X, B=2X
GOOD LUCK
ty i got it!!
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1 year ago
#10
(Original post by joke123132)
edexcel year 2 pure
oh ok thanks x
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1 year ago
#11
Application of trigonometric formulae in integration:
Change product to sum of difference
Change square or cube of trigonometric ratios to double or triple angles, to remove the index powers.
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X

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