Simplify the expression by using an appropriate identity. Do not use a calculator. (cos72)(cos 18°) -...

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Question

Answer 1

Answer #1

we know, cor (ATB) = cas A. COSB-SMA. SimB Cos (72%). (8 18°)- SimC78°). SimC18°) = Coch C72-+18) = cos(90°)

Answer 2

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