$\left[\left(2p-3\right)+q\right]^2$
$18+x=21$
$\frac{\cos a+\sin^3a-\sin a}{\sin a}$
$\left(3x^2+5x-2\right)^2$
$x^2-8x-12=0$
$\left(-3-2\right)\:.\:\left(-10\right)$
$\left(a+b^4\right)^2$
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