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Question

cot(90-tita)sin(90-tita)/ sin tita + cot40/tan50 - (cos square20 + cos square70). evaluate

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Solution

cot90°-θ sin 90° - θsin θ + cot 40°tan 50° - cos220° + cos270°=tan θ . cos θsin θ + cot90° - 50°tan 50° - cos290° - 70° + cos270°=sin θ . cos θsin θ . cos θ + tan 50°tan 50° - sin270° + cos270°=1 + 1 + 1=3

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