$\int\frac{x+10}{x^4+x^2}dx$

$2sin\left(2x\right)-4sin\left(2x\right)sin^2x=sin\left(4x\right)$

$\int\frac{6\cos^7\left(x\right)}{\csc\left(x\right)}dx$

$\frac{5csc\left(u\right)-1}{5csc\left(u\right)+1}=\frac{5-sin\left(u\right)}{5+sin\left(u\right)}$

$\frac{2x^3+4x^2-3x+8}{x-2}$

$\:\left(x+6\right)^2-\left(x+4\right)^2-2\left(2x+5\right)$

$75y+64-9$