$cot\left(t\right)=\frac{1}{5}$
$-2700\cdot3000$
$16m^212mn+81m^2$
$12d-15$
$\cos2x+\sqrt{2}\sin x=1$
$\sqrt{x-5}=2$
$\left(1-x^2\right)\left(1-x\right)$
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