$9y^2+4z^2-x^2-18y-16z+4x+21=0$

$1+1x^3$

$5\left(2\right)^2-6$

$1-\frac{\cos\left(^2\right)}{1+\sin\left(q\right)}=\sin\left(q\right)$

$9sec^2\left(x\right)-100cos^2\left(x\right)=100sin^2\left(x\right)$

$\lim_{x\to0}\left(\frac{x^2+\sin\left(\frac{1}{2}\right)}{\sin\left(x\right)}\right)$

$\frac{dy}{dw}=y\left(4w^3+1\right)$