$\left(1-\tan\left(a\right)\right)^2$
$5\left(-3x+1\right)$
$7x^2-5x-2=0$
$\left(5a+13^2\right)$
$-\frac{1}{5}\log\left(u\right)$
$4tan^2x-8tanx+3=0$
$x7:x$
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