matma

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Question		Answer
sin(α+β) start learning		sinacosb + sinbcosa
sin(α-β)= start learning		sinacosb - sinbcosa
cos(a+b)= start learning		cosacosb - sinasinb
cos(a-b)= start learning		cosacosb + sinasinb
sin2a start learning		2sinacosa
cos2a start learning		cos^2a - sin^2
cos2a start learning		1 - 2sin^2a
cos2a start learning		2cos^2a-1
sinx+siny start learning		2sin (x+y)/2 * cos (x-y)/2
sinx-siny start learning		2cos (x+y)/2 * 2sin (x+y)/2
cosx+cosy start learning		2cos (x+y)/2 * cos (x-y)/2
cosx-cosy start learning		-2sin (x+y)/2 * sin (x-y)/2

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