Evaluate (int^{frac{pi}{4}}_0sec^2 theta d theta)

A.
1 
B.
2 
C.
3 
D.
4
Correct Answer: Option A
Explanation
(int^{frac{pi}{4}}_0sec^2 theta d theta)
= ([tan theta]_{0} ^{frac{pi}{4}})
= (tan frac{pi}{4} – tan 0)
= (1 – 0)
= 1.
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