To enter mathematical expressions, you can benefit below table. To avoid any possible errors, it is better to use parentheses sufficiently.

Type See Type See
oo $\infty$ -oo $-\infty$
1/x $\dfrac{1}{x}$ sqrtx/sqrt(x^2+1) $\dfrac{\sqrt x}{\sqrt {x^2+1}}$
root(3)(x) $\sqrt[3] x$ root(5)(6x^4-x) $\sqrt[5] {6x^4-x}$
asinx $\arcsin x=\sin^{-1}x$ tan(x) cot(x) $\tan x \cot x$
asechx $\text{arcsech } x=\text{sech}^{-1}\;x$ sinx/cosx $\dfrac{\sin x}{\cos x}$
e^(sinhx) $e^{\sinh x}$ 2pi $2\pi$