$1+tan^2a$
$x\:+\:12\:<\:-1$
$\int23\left(t-4\right)^5\:dt$
$-561-430+678$
$-13+14+27-18-38$
$y^{\prime}+4y=20,y\left(0\right)=2$
$9y^2-6y+4$
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