$\left(-60\right)+5+\left(-4\right)\cdot5$
$\left(8x^3-14x^2+x+12\right)\cdot\left(4x+9\right)$
$ex=t+1$
$7x^2+28x-840$
$\int\frac{1}{x^4\cdot\sqrt{x^2+16}}dx$
$a^2+20-21a$
$\frac{\sin^2\left(x\right)}{\cos^2\left(x\right)}\cos^2\left(x\right)$
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