$sin2x=0$

$\frac{d^2}{dx^2}\left(x\cdot e^{yz}+4\tan^2\left(y\right)\right)$

$\frac{d}{dx}\left(\left(y^2-5x\right)^{\frac{1}{2}}\right)$

$\lim_{x\to0}\left(\frac{\arccos\left(1-x\right)}{\sqrt{x}}\right)$

$\left(2x^4+3x^6\right)^3$

$\sec\left(x\right)^2+cot\left(x\right)^2$

$13r+5s-2r$