$\frac{-1^{-2}}{2b}$

$\frac{\frac{x^4}{x+10}}{\frac{x^2}{x^2+17x+70}}$

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

$\frac{\left(4^{4-x}\right)^2}{8^{4x}}=1$

$sen\left(x\right)\cdot sec^2\left(x\right)\cdot cos\left(x\right)-csc\left(x\right)\cdot sen^2\left(x\right)\cdot sec\left(x\right)$

$2.5x+10=x-0.5$

$9x^2\:y\:3x^{3\:}y^4$