$\frac{3x}{2x-10y}\sqrt{x^2-10xy+25y^2}$
$u^2-53u+196$
$\lim_{x\to0}\left(\frac{1}{3}\right)\log_{\frac{1}{5}}\left(x\right)$
$x^2-8x+10=30$
$6,829+54,3+3,29$
$\lim_{x\to0}\left(\frac{x^2-16}{1-\sqrt[4]{x-3}}\right)$
$sen4x\:+\:2sen2xcos2x\:+\:cos2x\:=\:1$
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