$2\cos^2\left(3x\right)-1$
$25x^2-81x\tan=0$
$5x+2y-8x-y$
$\lim_{x\to0}\left(x^{\left(\frac{\ln\left(a\right)}{1+\ln\left(x\right)}\right)}\right)$
$\lim_{x\to0}\left(2+e^x\right)^{e-x}$
$\lim_{x\to0}\left(\frac{5^{sinx}-1}{3x}\right)$
$-2\cdot5^2$
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