$\frac{10a^7b^9}{15a^5b^9}$
$\frac{1}{x-5}+\frac{x}{3}=2$
$sin\:x\:=\:\frac{1}{csc\:x}$
$-4x-8y=7$
$ac+bc+ad+bd$
$sin2x+3sinx$
$15\left(\cos^2\left(3\right)+\sin^2\left(3\right)\right)$
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