$\left(x-a\right)\left(y-2\right)+b\left(2-y\right)$
$+4+3-a-b-a+-b-a+b$
$b\:-\:7\:=\:-20$
$-4y^2+4y$
$\int\frac{1}{\left(1+2\tan\left(x\right)\right)^2\cos^2\left(x\right)}dx$
$x^2-8x+16=225$
$3\left(7\right)\cdot4\left(11\right)$
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