Question
Simplify the following trigonometric expression: 11
sin 42° sec 48° − 7 tan 37° tan 53°Solution
= 11 sin 42° sec(90° - 42°) - 7 tan 37° tan(90° - 37°)
= 11 sin 42° csc 42° - 7 tan 37° cot 37°
= 11 - 7 = 4
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