Level:
Project ID:
1003108203
Accepted:
1
Compare the definite integral \( I=\int\limits_0^{\frac{\pi}4}\frac{\cos2b}{\cos^2b}\,\mathrm{d}b \) to the number \( \frac{\pi}2 \).
\( I \) is smaller than \( \frac{\pi}2 \) by \( 1 \).
\( I \) is bigger than \( \frac{\pi}2 \) by \( 1 \).
\( I \) is equal to \( \frac{\pi}2 \).
\( I \) is smaller than \( \frac{\pi}2 \) by \( \frac{\pi}4 \).