Question
Simplify the following trigonometric expression: 15
cos 27° sec 63° − 9 cot 61° tan 29°Solution
= 15 cos 27° sec(90° - 27°) - 9 cot 61° tan(90° - 61°)
= 15 cos 27° csc 27° - 9 cot 61° cot 61°
= 15 - 9 = 6
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