$4-\infty$

$-3.5x+0.2+.8x+3x+0.4$

$\lim_{x\to5}\left(\sqrt{x^2+14x+49}\right)$

$12\cos\left(x\right)-2=6$

$\int\:\frac{x^2-5x+16}{\left(2x+1\right)\left(x-2\right)^2}\:dx$

$\frac{1-\sin\left(a\right)\cos\left(a\right)}{\sin\left(a\right)}=\csc\left(a\right)-\cos\left(a\right)$

$\lim_{x\to o}\left(cot5xsin10x\right)$