$\frac{d}{dy}\left(\frac{13}{\left(10+t\right)^2\left(4-t\right)^6\cos\left(t\right)^4}\right)$

$\frac{d}{dx}\left(\ln\left(\mathrm{sech}\left(3x+8\right)\right)\right)$

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

$\frac{d}{dx}\left(\ln\left(1+x\right)\right)$

$\frac{d}{dx}\left(\sqrt{\frac{x\left(x+2\right)}{\left(2x+1\right)\left(5x+3\right)}}\right)$

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

$\frac{d}{dx}\left(\pi100^2=0\right)$

$\frac{d}{dx}\left(ln\left(tan\left(x\right)\right)\right)$