Sin v kvadrate a -1 + cos v kvadrate a+ (1-sin a)(1+sin a)

Question

Sin v kvadrate a -1 + cos v kvadrate a+ (1-sin a)(1+sin a)

Answer 1

Sin²a-1+cos²a+(1-sin²a)*(1+sin²a)
(sin²a+cos²a)-1+1-sin²a
1-1+1-sin²a
1-sin²a
cos²a

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