$\pi\pi\pi$
$\frac{\sin\left(4x\right)}{\sin\left(x\right)}=4\cos$
$\cos^2+\cos^2\sin^2$
$950-500$
$-2+81+2^2$
$x\frac{dy}{dx}=y\ln\left(x\right)-y\ln\left(y\right)$
$5+7+12+6+12$
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