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

$\left(\frac{1}{7}m-4\right)\left(\frac{1}{7}m+4\right)$

$\left(\left(7^{\left(2sinx+\sqrt{3}\right)}\right)=1\right)$

$12w^5y^5-16w^4y^4+18w^3y^3$

$5x^3-45y^2$

$\lim_{x\to0}\left(\frac{\ln\left(1+x^2\right)}{x\cdot\sin\left(x\right)}\right)$

$\lim_{x\to\infty}\frac{e^{2x}}{2x}$