$2ax^2-6a^2x$

$\int2x\left(5x^2-4\right)dx$

$\int\left(x+3\right)\left(1-x\right)^{-3}dx$

$\left(sinx+cosx\right)\left(sinx-cosx\right)+2cos^2x=1$

$\left(\sec\left(x\right)+1\right)\left(\sec\left(x\right)+1\right)=\tan\left(x\right)^2$

$\int\left(\frac{e^{4x}}{e^{4x}+7}\right)dx$

$\lim_{x\to-3}\left(5\right)$