Ihechukwu B.

asked • 04/04/22

Express sin(x+y)

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Raymond B. answered • 04/04/22

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sin(x+y) = sinxcosy + sinycosx


it's one of the sum and difference formulas for sines


the other formula is


sin(x-y) = sinxcosy - sinycosx


then there're the sum and difference formulas for cosines


cos(x+y) = cosxcosy - sinxsiny


cos(x-y) = cosxcosy + sinxsiny

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