$5\sec\left(x^2\right)\sin\left(2x\right)$

$\ln\left(x\right)+\ln\left(7\right)$

$x^4-2^3\:11^2\:+30x-20$

$\int_3^6\left(1000x\left(e^{-x}\right)\right)dx$

$2+3\left(2\left(4+5\right)\right)+7-3\left(1+2\right)$

$\frac{6}{x^2}-\frac{9}{x}=-\frac{4}{3}$

$\int\left(\pi sec^2\left(\pi x\right)\right)dx$