$\frac{1+\cos\left(a\right)-\sin\left(a\right)}{1+\cos\left(a\right)+\sin\left(a\right)}=\sec\left(a\right)-\tan\left(a\right)$

$\left(7z+6x^2y\right)\left(7z+6x^2y\right)$

$\frac{12x^{15}}{3x^5}$

$\left(-2xy^2\right)^5\left(\frac{x^2}{8y^3}\right)$

$\frac{dy}{dx}\left(y^{\left(\frac{x}{10}\right)}\right)$

$\frac{7}{6}-\frac{5}{3}+3-\frac{1}{2}$

$1.62\:+1.67+1.60+1.20+1.00+1.48$