$12x-10=-13+9x$

$8\cdot log\left(x\right)=256$

$\lim_{x\to\infty}\left(\frac{1-sin\left(x\right)}{1+cos\left(6x\right)}\right)$

$\frac{d}{dx}\:\frac{1}{2\:}\:csc\:\frac{x}{4}$

$\frac{dy}{dx}-\frac{y}{x}=6x^2$

$\frac{dx}{dt}=8-3x;\:x\left(0\right)=0$

$f\left(x\right)=\:3\:e\left(ln\right)\left(x^2\right)$