Find \(\int_0^{\frac{π}{4}} \,9 \,cos^2⁡x \,dx\).

Discussion

Find \(\int_{-1}^1 \,2xe^x \,dx\).
Find \(\int_0^{π/4} \,2 \,tan⁡x \,dx\).
Find \(\int_0^3 \,e^x \,dx\).
Find \(\int_{-2}^1 \,5x^4 \,dx\).
Find \(\int_{π/4}^{π/2} \,2sinx \,sin⁡(cos⁡x) \,dx\).
Find \(\int_0^2 \,e^{2x} \,dx\).
Find \(\int_0^{\frac{π}{4}} \,9 \,cos^2⁡x \,dx\).
Find the value of \(\int_4^5 \,log⁡x \,dx\).
Find \(\int_0^{\frac{π}{2}} \,5 \,sin⁡x \,dx\).
Find \(\int_0^8x \,dx\).