$\sin x\left(\csc x+\sin x\sec^2x\right)=\sec^2x$

$2r^2+6r+7+3r^2+5r+8$

$\int tan^54x\:dx$

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

$\frac{x^3-5x^2-2x+24}{x-3}\:$

$-\left(-7n+8\right)+8$

$\int\left(\frac{2}{x^3}-\frac{1}{x^2}-\frac{1}{x}\right)dx$