$2-\frac{a-1}{a+2}=-\frac{a^2-1}{a+2}$
$a=-3;b_{=6}$
$\int7x\cos\left(2-x^2\right)dx$
$\sin^2\left(x\right)+11sin\left(x\right)+4=0$
$9 x ^ { 2 } + 16 y ^ { 2 } + 24 x y$
$16b^2+\:8bc^33+c^2$
$\int\tan^{-1}\left(\sqrt{2x}\right)dx$
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