$\frac{d}{dx}\ln\left(\frac{\sqrt{x}}{2^xtan^5x}\right)$

$\frac{csc\left(x\right)}{\cos\left(x\right)}+\frac{sec\left(x\right)}{sin\left(x\right)}=2$

$\lim_{x\to1}\left(\frac{x^2-2x+1}{cos\left(x-1\right)-1}\right)$

$\tan x\left(\csc x+1\right)=\frac{1+\sin x}{\cos x}$

$14x^2-10x$

$\frac{x^{15}-y^{15}}{y+x}$

$\frac{cos^2x-sen^2x}{sinx\cdot cosx}=cscx$