Question
Simplify the following trigonometric expression: 9 sin
36° csc 54° − 7 tan 47° cot 43°Solution
= 9 sin 36° csc(90° - 36°) - 7 tan 47° cot(90° - 47°)
= 9 sin 36° sec 36° - 7 tan 47° tan 47°
= 9 - 7 = 2
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