$13b+10b-7b\left(b=2\right)$

$11x^2-98x-120$

$\int\csc^2x\sec xdx$

$\lim_{x\to\frac{x}{2}}\left(8cos\left(3x\right)sec\left(5x\right)\right)$

$\frac{\left(sec\left(x\right)-cos\left(x\right)\right)}{cos\left(x\right)}=\left(tan\left(x\right)\right)^2$

$\left(-16\right)\left(27\right)$

$\int\frac{\left(x-1\right)}{\left(x+1\right)^2\left(x+3\right)}dx$