Find \(\int_0^{\frac{π}{4}} \,9 \,cos^2x \,dx\).
Posted: Wed Jul 13, 2022 8:08 pm
a) \(\frac{9}{2}\left (\frac{π}{6}-1\right)\)
b) \(\frac{9}{4}\left (\frac{π}{2}+1\right)\)
c) \(\frac{9}{4}\left (\frac{π}{2}-1\right)\)
d) \(\left (\frac{π}{2}-1\right)\)
b) \(\frac{9}{4}\left (\frac{π}{2}+1\right)\)
c) \(\frac{9}{4}\left (\frac{π}{2}-1\right)\)
d) \(\left (\frac{π}{2}-1\right)\)