$y2\left(a-x\right)$

$\int\left(x^3+3x\right)^8\left(x^2+1\right)dx$

$\left(x+1\right)\left(x+2\right)\left(x-3\right)-4x\left(x-1\right)$

$\lim_{x\to\frac{\pi}{2}}\left(tan\left(x\right)-\frac{1}{1-sinx}\right)$

$\int\frac{\sec^2\left(2x\right)}{1+\tan\left(2x\right)}dx$

$\int_0^{\frac{1}{4}}\left(\frac{4x}{\sqrt{9-x^4}}\right)dx$

$\left(xe^x\right)^{\pi}$