The mark scheme says you have to manipulate it to cosx-cos5x before you can integragte but does not elaborate on how!
Could someone give me a clue as to what trigonometric identities I should be using here?
Major thanks to anyone who can help. peace
Blogs > Heggie |
Heggie
United Kingdom167 Posts
The mark scheme says you have to manipulate it to cosx-cos5x before you can integragte but does not elaborate on how! Could someone give me a clue as to what trigonometric identities I should be using here? Major thanks to anyone who can help. peace | ||
Plutonium
United States2217 Posts
sin(x)sin(y) = [cos(x - y) - cos(x + y)] / 2 Though I'm not sure why you can't just integrate the first form. | ||
Heggie
United Kingdom167 Posts
How would you integrate in the first form out of interest? | ||
Plutonium
United States2217 Posts
It probably involves U-V integration though. | ||
Wohmfg
United Kingdom1292 Posts
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Heggie
United Kingdom167 Posts
No matter how many times you apply it I don't think it will make either of the xs "disappear", so you will still have a product of two functions of x in the integral you subtract. | ||
Wohmfg
United Kingdom1292 Posts
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KlaCkoN
Sweden1648 Posts
(Do it twice you get the original primitive back but multiplied by a constant, solve for it algebraically.) | ||
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