$77.2-43.778$

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

$\left(-5a^3b^2+3a^2b\right)\left(-3a^2b-5a^3b^2\right)$

$5,4\:x\:10^4$

$\left(\:m^3-\:y^4\right)^2$

$\frac{\sin\left(x\right)-\sin\left(x\right)\cos\left(x\right)}{\sin\left(x\right)}=\sin\left(x\right)$

$\frac{x^5-8x^3+36x-33}{x+2}$