$\frac{1-sin^2x}{cos^2x}+tan^2x$
$x-5x+36$
$20-\left(-2-7-5-3-1\right)$
$\frac{4}{5}pq,p=5,q=5$
$3x^2+5x+20x^2$
$\left(4x^3b^5\right)^3$
$\left(-3b^2\right)\left(-4a^3b\right)\left(4a\right)$
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