$\frac{\csc\left(x\right)\tan\left(x\right)}{\sec\left(x\right)}-\sin\left(x\right)\left(\csc\left(x\right)-\sin\left(x\right)\right)=\sin^2\left(x\right)$

$13-38+7x+2$

$\left(13m-7n\right)^2$

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

$\lim_{x\to0}\left(\frac{2^x-3^x}{x^1}\right)$

$-4w+w$

$3x^2+4x+4=3$