$d_h=v_ht$
$127.005+248.6$
$x\left(3x^4\left(x-1\right)+2x^2+3\right)$
$cos\:^2x\:=1$
$cos^2\theta\:=sin^2\theta\:$
$\frac{d}{dx}\left(-\arctan\left(5x^4\right)\right)$
$\left(7x^2+9x\right)-3\left(x^2+8\right)$
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