Question
Simplify the following trigonometric expression:
14 tan 25° cot 65° − 6 cos 39° sec 51°Solution
= 14 tan 25° cot(90° - 25°) - 6 cos 39° sec(90° - 39°)
= 14 tan 25° tan 25° - 6 cos 39° csc 39°
= 14 - 6 = 8
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