$\sqrt{1}\cdot\sqrt{18}\cdot\sqrt{21}$

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

$\int_{\ln\left(\frac{\pi}{6}\right)}^{\ln\left(\frac{\pi}{2}\right)}\left(2\cdot e^x\cdot\cos\left(e^x\right)\right)dx$

$\int\left(-3\left(t+2\right)^{-2}\right)dt$

$\int2cos^5\left(x\right)sin^4\left(x\right)dx$

$3\cdot1^2+1$

$\int\left(\frac{\sqrt{10-x}}{x}\right)dx$