Question

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Expand cos(A + B + C). Hence prove that
cos A cos B cos C sin A sin B cos C + sin B sin C cos A + sin C sin A cos B
if A + B + C =
$\pi \div 2$
​

Answer 1

Answer:

sorry I don't know maths that much

Step-by-step explanation:

I know only basics

Answer 2

Answer:

good morning my love for Chad