$\frac{\frac{sin\left(a\right)^2+cos\left(a\right)^2}{cos\left(a\right)}}{sin\left(a\right)}=sec\left(a\right)csc\left(a\right)$

$12x^2-15x\ge18$

$\int\left(x+1\right)^2\cdot\sqrt{3+x}dx$

$8\frac{2}{5}.\left(-\frac{2}{1}\right)$

$\frac{dy}{dx}\left(\sqrt{x+y}=x+y\right)$

$\lim_{x\to0}\left(\frac{5e^{x-5}}{x}\right)$

$10\:-\:\left(-15\right)\:+\:3\:-\:8\:$