$\left(-11a+15b\right)\left(11a+15\right)$

$-2\sin\left(4x\right)=-2$

$\int_{\frac{\pi}{6}}^{\frac{\pi}{3}}\left(3\csc^2\left(x\right)-5\sec\left(x\right)\tan\left(x\right)\right)dx$

$9^3\cdot9$

$0.30\cdot36+0.35\cdot44+0.35\cdot38$

$\lim_{u\to1}\frac{\left(3u+4\right)\left(2u-2\right)^3}{\left(u-1\right)^2}$

$\frac{1}{9}\left(z+2\right)$