$\left(10m+4n\right)\left(10m\:-4n\right)$

$3a-8a+2a+6a-5a$

$\int_0^3\left(\frac{5}{8}mx+4x-\frac{x^2}{2}\right)^2dx$

$\frac{1}{\cos\left(x\right)}=\:\frac{sin2\left(x\right)cos\left(x\right)-cos2\left(x\right)sin\left(x\right)}{sin\left(x\right)cos\left(x\right)}$

$\left(-\frac{1}{4}\right)+\left(-\frac{15}{4}\right)$

$\cos^2\frac{x}{3}-\sin^2\frac{x}{3}$

$\frac{2a-3}{a-1}=\frac{2a+3}{a+1}+\frac{10}{a+1}$