$\left(cos^2\left(x\right)-cos\left(x\right)\right)\left(1+sec\left(x\right)\right)=-sin^2\left(x\right)$

$\sin x=\left(1+\tan y\right)$

$\left(5a^3^3+6\right)\left(5a^3^3-6\right)$

$\left(6ad+\sqrt{2}\right)^2$

$2^{\frac{1}{8}+\frac{7}{8}}$

$\lim_{x\to\infty}x^3e^{x^{-2}}$

$\frac{1-2x}{x+2}\le-2$