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$10\sin^2x=5-5\cos2x$
$2x\left(a-1\right)-y\left(a-b\right)$
$coshx=\frac{e^x+e^{-x}}{2}$
$6+3x^4\cdot x+1^6$
$-x^2y+x^22y$
$\frac{d^2}{dx^2}\left(0\right)$
$\lim_{x\to-\infty}\left(\frac{x+2}{x^2+4x+3}\right)$
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