$\sqrt{x^2y^2}$
$\int\sin x\sin\left(-x\right)dx$
$a^2-7a^2-30$
$x'=-2x+4e^{-t}$
$\left(2\sin x-\cos x\right)\left(2\sin x+\cos x\right)=5\sin^2x-1$
$3a^2+5^2$
$\frac{4\left(x+16\right)}{x+4}$
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