$\left(81t\right)\frac{1}{2}$
$\int_0^{\pi}+\sin^2\left(x^2\right)dx$
$81^2-90x+25$
$\frac{dy}{dx}+\frac{y}{x}=3x+4$
$-12a^2+6ab-15a^2b^2$
$b^2-b-30$
$sin\left(\frac{x}{4}\right)=-\frac{\sqrt{3}}{2}$
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