$\sin\left(x+50\right)=-0.9$

$\lim_{x\to3}\left(\frac{\sqrt[2]{x}-\sqrt[2]{3}}{x-3}\right)$

$\frac{dy}{dx}=\frac{1-x^2}{x^2}$

$3x\cdot2x^2$

$\lim_{x\to1}\left(\frac{log\left(x\right)}{\frac{1}{log\left(x-1\right)}}\right)$

$-3\left(6-4x\right)=4-\left(5x-\left[6x-\left(4x-\left(3x+2\right)\right)\right]\right)$

$6a^2+a-2$