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Question

Simplify 1+sin(3π2α)sin(π2+α)1 into a product.

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Solution

1+sin(3π2α)sin(π2+α)1
sin(π2+α)1+sin(3π2α)sinπ2cosα+sinαcosπ21
cosα1+sin3π2cosαsinαcos3π2cosα1
cosα1cosαcosα1=11cosα=12sin2α2
=12cosec2α2.

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