$\left(4x+5\right)\left(9x-1\right)$

$-2\cdot\left(-3\right)\cdot10+\left(-4\right)\cdot2$

$y'=\frac{2x+1}{5y^4+1}\:\:$

$\frac{6x^2+2}{7x^2-2x}$

$\frac{dx}{dy}=\frac{\left(x+1\right)\left(y+1\right)}{\left(x+2\right)\left(y-1\right)}$

$\int sen^42xcos^32xdx$

$\sin\left(-x\right)+3cos^2\left(x\right)+7sin\left(x\right)+4$