$3b\left(2b^2-b+8ab-a\right)+a$

$\frac{sec\left(x\right)}{cos\:\left(x\right)}-\frac{tan\left(x\right)}{cot\left(x\right)}\:\left(x\right)=1$

$\frac{dy}{dx}=\sin\left(5t\right)$

$\left(4x^3-x^2-6x-9\right)+\left(12x^3-3x^2+6x\right)$

$\int\frac{x}{\left(x^2+8x+21\right)^{\frac{5}{2}}}dx$

$5\left(2\right)^2-2\left(5\cdot3\right)-3\left(1\right)$

$0:45$