$xy+y=y^2$

$\frac{2cos\left(x\right)}{1+sin\left(x\right)}+\frac{2+2sin\left(x\right)}{cos\left(x\right)}$

$7x^3\cdot\left(-6x^2\right)$

$1+16x+64^2$

$\left(b^2\cdot a\cdot c^{-3}\right)^2\left(b^{-2}\cdot a^{-3}\cdot c^4\right)^3$

$\int e^{-2x}\sin\left(2x\right)\:dx$

$\int\frac{\left(7x-13\right)}{x^2-3x-4}dx$