The average value of \( f(x)=\sec ^{2} x \) from \( x=0 \) to \( x=...

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The average value of \( f(x)=\sec ^{2} x \) from \( x=0 \) to \( x=\frac{\pi}{4} \) is
P
IV
(a) \( \frac{\pi}{4} \)
(b) \( \frac{\pi}{2} \)
(c) \( \frac{2}{\pi} \)
(d) \( \frac{4}{\pi} \)
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