Using the fact that and the differentiation

MATHEMATICS · Subjective · A Level · Mathematics · Differentiation · Differentiation

Problem

19. Using the fact that sin⁡(A+B)=sin⁡Acos⁡B+cos⁡Asin⁡B\sin (\mathrm{A}+\mathrm{B})=\sin \mathrm{A} \cos \mathrm{B}+\cos \mathrm{A} \sin \mathrm{B} and the differentiation, obtain the sum formula for cosines.

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