$\frac{-2x}{5}+1<4$
$-10.675\:-\left(-3.21\right)$
$a^2-21a+25$
$\frac{d}{dx}y^4-4x^4=6xy$
$t^4+31=20$
$-21\cdot2$
$\int160\csc\left(x\right)^2dx$
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