$2a\left(2\right)x+2a\left(2\right)x\left(2\right)-3ax$

$10x^2-2x+3$

$\int\cos\left(2x\right)^{-1}2dx$

$\lim_{x\to64}\left(\frac{\sqrt{t}-8}{x-64}\right)$

$\left(x-3\right)\left(x+10\right)$

$\lim_{x\to2}\left(\frac{7\sin\left(x-2\right)\sec\left(x-2\right)}{\tan\left(x-2\right)}\right)$

$\frac{64a^3+343^3}{4a+7}$