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Sum
Find the value of :
sec (– 855°)
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Solution
sec (– 855°) = sec 855°
= sec (720° + 135°)
= sec (2 x 360° + 135°)
= sec 135°
= sec (90° + 45°)
= – cosec 45°
= `-sqrt(2)`
Concept: Trigonometric Functions of Allied Angels
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