$\int_0^a f(x) \, dx = $

If $m, l, r, s, n$ are integers such that $9 > m > l > s > n > r > 2$ and $\int_{-2 \pi}^{2 \pi} \sin ^m x \cos ^n x \, dx = 4 \int_0^\pi \sin ^m x \cos ^n x \, dx$,$\int_{-\pi}^\pi \sin ^r x \cos ^s x \, dx = 4 \int_0^{\pi / 2} \sin ^r x \cos ^s x \, dx$ and $\int_{-\pi / 2}^{\pi / 2} \sin ^l x \cos ^m x \, dx = 0$,then which of the following is true?

The value of $\int_{-3}^3 \sin ^7 x \cos ^{16} x \,dx$ is

The value of $\int_{-1 / 2}^{1 / 2} \cos ^{-1} x \, dx$ is

The value of $\int_{-1}^1 \sin^5 x \cos^4 x \, dx$ is

If $a > 0$,then $\int_{-\pi}^{\pi} \frac{\sin^2 x}{1+a^x} dx$ is equal to