$\frac{-4^5}{-4^2}$
$6.47-3.109$
$2sinxcosx=0.75$
$\frac{9m^2-1}{3m-1}$
$2x^2-14x+49$
$\frac{x}{5xy}$
$sec\:\left(x\right)^2\:-\:cos\:\left(x\right)^2\left(sec\left(x\right)^2\right)$
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