$\left(\frac{\left(14a^2b^7\right)}{2a^5b}\right)^{-2}$
$3x^2-x+5=2$
$y=\left(1+\sqrt{1-x}\right)^2$
$3x+2y=-6$
$x+10=12$
$\frac{\cos5a-\text{cosa}}{\sin5a-\text{sina}}$
$\left(-130\right)\cdot\left(-65\right)$
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