$\left(52\right)\cdot\left(-78\right)$

$7^27$

$\left(x-10\right)<\frac{3}{5}\left(x+20\right)$

$\frac{d}{dx}\left(3cos\left(n\theta\right)\right)$

$\left(2x^3+3y^2\right)\left(4x^6-6x^3y^2+9y^4\right)$

$1-2\sin^2a=2\cos^2a-1$

$4x^2-9\left(2x+3\right)\left(2x-3\right)$