$\left(a-7\right)\left(a+10\right)$
$\int\left(sin3x\right)\left(cos4x\right)dx$
$\lim_{x\to\infty}\left(27-\frac{27\left(x+1\right)\left(2x+1\right)}{6x^2}\right)$
$2a^2+7a^2-5a+2a$
$3x^2-28x+25=8x^2-43x+43$
$\left(3b+4\right)\left(3b+4\right)$
$\int\frac{1}{\left(4-9x^2\right)}dx$
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