$cos\left(x\right)+2\sin^2\left(x\right)=\sin^2\left(x\right)+1$

$\frac{dy}{dx}=\frac{1}{\left(x+2\right)y^2}$

$-5\cdot11\cdot3$

$\lim_{x\to1}\left(\frac{7x+9}{x-1}\right)$

$\frac{dy}{dx}\:x\left(t\right)=asec\left(e^t\right);\:y\left(t\right)=btan\left(a^t\right)\:$

$in\:x\:+\:in\:x^2=5$

$\left(4.5\right)^2$