$cos\left(x\right)csc\left(x\right)+\left(-cos\left(x\right)cot\left(x\right)\right)sin\left(x\right)$

$5y\cdot\frac{2x}{5}$

$100-4x^2$

$\left(\frac{a^4}{4}\right)^{-\frac{1}{2}}$

$\int\frac{x}{x^3+x^2+x+1}dx$

$\left(1+\left(-6\right)\right)\cdot\left(-4\right)$

$7x+5y\:7x+5y\:9x+2y\:9x-2y$