$\log_{\frac{1}{4}}\left(x+4\right)=-2$

$\frac{dy}{dx}=y+x^2sinx$

$\lim_{x\to-1}\left(\frac{x^2-4x}{x^2-3x-4}\:\:\:\right)$

$\int4\arccos\left(x\right)dx$

$\left(\frac{1}{\tan\left(\frac{\pi}{3}\right)}\right)^2$

$\sec\left(x\right)\cos\left(x\right)-\cos\left(x\right)\sin\left(x\right)\cot\left(x\right)=\sin\left(x\right)^2$

$3r+17r$