http://en.wikipedia.org/wiki/Trig_identities
]]>To:
First step, as always, is to simplify:
Now it becomes fairly simple, just use the trig identity:
Where a = x and b = nx
Which simplifies to:
]]>To:
]]> 1 phi
- ( ∫ A sin x . cos nx dx)
phi 0
into:
A 1 phi
- . - . ∫(sin (1+n)x + sin (1-n)x )dx
phi 2 0
thanks before...
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