$\lim_{x\to0}tan\left(x\right)sec\left(x\right)$

$\int3cos^5xdx$

$\lim_{x\to\infty}\left(\frac{5x^2-3x+2}{3x^3+2x^2-1}\right)$

$\int_0^1\left(e^{x+iy}\right)dx$

$log\frac{x^2-x-2}{x^2+8x-9}$

$\frac{\sin\left(x\right)\cos\left(x\right)}{1-\sin^2\left(x\right)}$

$\frac{dy}{dx}=\left(5-x\right)^2$