$\left(4s+5\right)\left(4s-7\right)$

$sin^2\left(x\right)+\frac{1}{sec^2\left(x\right)}+\frac{1}{tan^2\left(x\right)}=csc^2\left(x\right)$

$3.4-2.4$

$\int\left(\frac{3x^2+x-8}{x^3+4x}\right)dx$

$\frac{3}{2}-2\:x>\frac{4x}{3}-2$

$\int-\frac{6}{\sqrt{36-49x^2}}dx$

$\lim_{x\to\infty}\left(\frac{\sqrt{5+6x^2}}{18-15x}\right)$