$0\cdot\infty+\infty$

$\int x\left(cos2x-sin5x\right)dx$

$\int\frac{10x}{\left(1+0.5x\right)^2}dx$

$x^2+18x+81=1$

$\left(2\sqrt{5}+3\sqrt{2}\right)\left(2\sqrt{5}-3\sqrt{2}\right)$

$\left(2u^2v^3\right)^3\left(3u^{-3}v\right)^2$

$\int7^x\sec\left(7^x\right)\tan\left(7^x\right)dx$