$x-10<30$
$0=cosxsen2x-senx$
$\frac{x^{-4}x^2y^{-8}}{y^3}$
$7x\ge x+30$
$\tan^2\left(x\right)+4\tan\left(x\right)=21$
$-5\left(-7\right)$
$\frac{m^2-5^2}{m+5}$
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