Answer :

To find: Value of

We have,



[ sec(-θ) = sec θ]


Putting π = 180°



= sec[25 × 60°]


= sec[1500°]


= sec [90° × 16 + 60°]


Clearly, 1500° is in Ist Quadrant and the multiple of 90° is even


= sec 60°


= 2


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