$\cos\left(x\right)^2+4\sin\left(x\right)=4$

$6\sin\left(x\right)+2\csc\left(x\right)=7$

$\lim_{x\to0}\left[\frac{e^x-e\sin^x}{x-\sin x}\right]$

$-7a\cdot2$

$0.037\cdot x=37$

$10+2-5+2$

$\frac{d}{dx}\left(\ln\left(\frac{14^x\sqrt{x+9}}{\left(x+1\right)^2}\right)\right)$