$\lim_{x\to0}\left(\frac{2t+e^t+e^{3t}}{1-cos\left(3t\right)}\right)$

$35.92-8.75$

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

$\frac{sin4\left(t\right)}{4}=cos^3\left(t\right)sin\left(t\right)-sin^3\left(t\right)cos\left(t\right)$

$f\left(x\right)=3x\frac{2}{3}-2x$

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

$\left(x-3\right)^2=4\left(x-5\right)$