Suggested: cos(x+y)=cosx cosy-sinx siny derivation - cosx-cosy/x-y limit - sinx-siny/cosx+cosy=tan x-y/2 - cos(x+y)=cosx cosy-sinx siny proof - prove that (cosx-cosy)^2+(sinx-siny)^2=4cos2x+y/2) - (cosx cosy)%5E2+(sinx siny)%5E2=4sin%5E2x y 2)catcat Browse related:
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