$cos\:y^2-sin\:y\:^2=1-2sin\:y^2$

$-3\cdot4\cdot\left(-2\right)\cdot\left(-7\right)$

$\left(-2\right)^4-\left(-2\right)^3-3\left(-2\right)^2+4\left(-2\right)-4$

$4gx\frac{dg}{dx}=x^2+1$

$\frac{p}{p}$

$\frac{7^9}{7^6}$

$\left(y^4-6y^3+2y^2+3y-4\right)\left(y^2-y+2\right)$