$\frac{\left(1+cot^2\left(x\right)\right)}{sec^2\left(x\right)}+cos^2\left(x\right)+\left(\frac{1}{csc^2\left(x\right)}\right)$

$\left(\frac{1}{2}x^2+\frac{2}{3}y^2\right)^5$

$k^5.k^5$

$\frac{dy}{dx}\left(x\sqrt{x^2+7}\right)$

$\left[5\left(5x\right)+4y\right]\left[5\left(5x\right)-4y\right]$

$-6+2-\left(6-7+2-\left|-8-3\right|-2\right)-3$

$\lim_{x\to\infty}\left(1-\frac{2}{3x}\right)^{x^2}$