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Question
Evaluate:
cos 40° cosec 50° + sin 50° sec 40°
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Solution
cos 40° cosec 50° + sin 50° sec 40°
= cos (90° – 50°) cosec 50° + sin (90° – 40°) sec 40°
= sin 50° cosec 50° + cos 40° sec 40°
= 1 + 1
= 2
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