$4-9n^2$
$\left(t^2+1\right)\:\frac{dy}{dx}=2y$
$\left(x^2+1\right)\left(x-1\right)^{\frac{1}{2}}$
$-a^2-10a+25$
$2^2.2^3$
$\left(-5\right)^2.\:\left(2-\left(-3\right)^2\:\right).\:4$
$\int_{3x}^3\frac{u^2-1}{u^2+1}du$
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