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Question

Simplify: (1+tana2seca2)(1+tana2+seca2)+sinasec2a2

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Solution

(1+tana2seca2)(1+tana2+seca2)+sinasec2a2=1+tan2a2+2tana2sec2a2+sinasec2a2
=2tana22tana2=0

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