$\left(t^2+1\right)y'+ty=t$
$-\left(-2\right)^2+3\left(-2\right)$
$-9-\left(-10+\left(15-25\right)\right)$
$9x^6-100x^4$
$2sin\left(x\right)cos\left(x\right)cos\left(y\right)+1-2sin\left(x\right)^2sin\left(y\right)$
$\left(6^7\right)^8$
$2x+2<\sqrt{3}$
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