$1-sinx=cos2x$
$5a-5a^3+4-a+a^3+2$
$\frac{dy}{dx}=\frac{x}{-2y}$
$\lim_{x\to-\infty}\left(\frac{2x^2+-4}{x-\sqrt{2}}\right)$
$\sin\left(45+\cos45\right)$
$25x^4-25y^4$
$\lim_{x\to0}vf$
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