$\left(-24\right):\left(-6\right)-2\left[8:\left(-4\right)-\left(-2-3\right)\right]-1$

$\sec\left(x-50\right)=2.15$

$\int\frac{x^4-1}{x^3-x^2+9x}-9dx$

$y=\left(4\tan\left(x\right)\right)^{\sqrt{x}}$

$\frac{dy}{dx}=\:\frac{\:\left(y^3\:+\:4y\right)}{x\left(y^2\:+\:2y\:+\:4\right)\:}$

$\int_0^{\frac{\pi}{2}}\left(\left(\frac{1}{x\sqrt[2]{x^2-2}}\right)\right)dx$

$\frac{-5+5cos^2\left(x\right)}{sin^2\left(x\right)}$