$2-44$

$\lim_{x\to2}\left(\frac{-x+16}{4-x^2}\right)$

$\frac{csc^2\left(x\right)}{tan\left(x\right)+cot\left(x\right)}$

$2\sin\left(x\right)^2\tan\left(x\right)-\sin\left(x\right)^2=0$

$5x^4-20x^2$

$-\:\:-\:6\:+\:\left[2\:-\:4\:-\:\left(4\:-\:3\right)\:+\:\left(7\:-\:3\right)\:\right]\:+\:2\:\:-\:1$

$\int\left(x^8\sin\left(x\right)\right)dx$