$2^3+8^2-5^2$

$\int_0^{3.14}\left(\sin^5\left(\frac{1}{2}x\right)\cos^7\left(\frac{1}{2}x\right)\right)dx$

$\left(3x-2x^2\right)\left(5+4x\right)$

$\frac{d}{dx}x^3y^2=a$

$s\left(t\right)=12t-t^3$

$400-\frac{t^2}{4}$

$\int_1^{\infty}\left(\frac{x}{\left(1+x\right)^2}\right)dx$