Find the value of
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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