結果 : integration of cosa cosb
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Prove `int_a^b sin xdx = cos a - cos b`.

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Cos(A+B)=CosACosB-SinASinB

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( cosA + cosB/sinA - sinB )^n + ( sinA + sinB/cosA - cosB )^n = xcot ^nA - B/2 or a, accordingly…..

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SEE|| CLASS 10 (1-CosA+CosB-Cos(A+B))/(1+CosA-CosB-Cos(A+B))=tan A/2 cot B/2

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