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

$6\sin\left(\frac{\pi}{10}\right)\cos\left(\frac{\pi}{10}\right)$

$\int_{\frac{\pi}{3}}^{\frac{2\pi}{5}}\sec^2xdx$

$m^2+5m+14$

$8a^2-80x$

$\left(\frac{3}{4x}+\frac{y}{5}\right)\left(\frac{3}{4x}-\frac{y}{5}\right)$

$\lim_{x\to0}\left(\frac{\left(3a+1\right)}{\left(2x+1\right)}\right)$