$4=\frac{2}{7}x$
$\lim_{x\to0}\left(\frac{2sin3x}{x}\right)$
$34.93+14.33$
$\frac{x^7}{\left(1+x^2\right)^2}$
$\tan\left(x\right)\frac{1}{\sin\left(x\right)}=\frac{1}{y}$
$x^2-10^2x+21$
$\lim_{x\to0}\left(\frac{cosx-cos2x}{x-cosx}\right)$
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