$\frac{1}{sec\theta\:\:tan\theta\:}\:=\:csc\theta\:-sin\theta\:$

$3x>900$

$\lim_{x\to0}\left(\frac{36x\cos\left(x\right)-36\sin\left(x\right)}{x\sin^2\left(x\right)}\right)$

$\left(m-f\right)^3$

$-98-56+-14$

$3\left(x+8\right)=5\left(x-1\right)+7-2x$

$\lim_{x\to0}\left(\frac{sin\left(x+\pi\right)}{x}\right)$