$\frac{\left(sin\left(x+y\right)\right)}{sinxcosy}$

$\lim_{x\to0}-\left(\frac{1}{x^2}\right)^{\tan\left(x\right)}$

$4x^3+10x^3$

$27^{2x}=3^{2x+4}$

$\int\frac{\left(\sqrt{x^2+3}\right)}{x}dx$

$\frac{dy}{dx}=\frac{3x}{7y}$

$\lim_{x\to0}\left(\frac{\ln\left(1-x^2\right)}{\tan\left(\pi x^2\right)}\right)$