$8\sin\left(x\right)\cos\left(x\right)+\cos\left(x\right)$

$\lim_{x\to2.01}\left(\sqrt{\frac{2+x}{2-x}}\right)$

$\frac{2\pi}{3}+\pi$

$\frac{5x+7}{x^2+2x-3}$

$63=x^2+2x$

$-2\sqrt{cos\left(y\right)}+\frac{4}{5}cos^{\frac{5}{2}}\left(y\right)-\frac{2}{9}\cos\:^{\frac{9}{2}}\left(y\right)$

$\left(2x^3y+x^5y^2\right)^2$