$3x^4+21x^3+2x+14$
$\cot\left(37\right)\cdot\cos\left(53\right)\cdot\tan\left(53\right)$
$\ln\left(x-3\right)-\ln x=1.5$
$sen^4x\:+\:sen^2x\:=0$
$1+\sin^{2}\theta\sec^{2}\theta$
$\left(2\right)^{8x}=\left(32\right)^8$
$e^{-x}y'=x^3$
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