$\int\frac{\left(x^5+x-1\right)}{x\left(x^3+1\right)}dx$

$a\left(a+2\right)$

$r=\left(x+1\right)^2+\left(x+2\right)^2-2x\left(x+3\right)$

$\:\cos\:^2\left(2x\right)-\sin\:^2\left(2x\right)=cos\:4\:x$

$192a^2b^2c^2-147a^2$

$\int_o^{\frac{\pi}{2}}\cos^2\left(x\right)sin^6\left(x\right)dx$

$\frac{5}{6x}=\frac{4}{5x}$