$f\left(x\right)=\left(cosx\pi\right)^2$

$tan^{\left(2\right)}\left(y\right)-sin^{\left(2\right)}\left(y\right)=tan^{\left(2\right)}\left(y\right)sin^{\left(2\right)}\left(y\right)$

$7bc^2-11bc^2$

$\:3c+5c$

$\lim_{x\to\infty}\frac{\left(\sqrt{2+x}\right)-3}{x-7}$

$\int_3^5\left(3x\right)dx$

$x-20-4x-2$