$\left(-a^7\right)\left(a^{-6}\right)$
$5sin2x+1=cos^22x$
$\left(10s^4-\frac{5fg}{\sqrt{3}}\right)^2$
$\frac{siny}{cosy}$
$\left(sena+cosa\right)^2$
$ax-2bx-2+4byay$
$\sqrt{1250}\cdot\sqrt{1250}$
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