$2.345+65.834-23.523$
$38.975+.216+1.35$
$sec^4+sec^2$
$\cos\left(4x\right)x\cos\left(2x\right)+\sin\left(2x\right)x\sin\left(4x\right)$
$-120+82+4$
$\frac{d}{dx}-2x^4-x^3+7x$
$4^2-0$
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