$x^{-\frac{4}{3}}$
$cos2x+3sent=2$
$\sin2x.\cos x-2\sin\left(3\right)$
$3\sqrt{\left(\sin\left(u\right)\cos\left(u\right)\right)}$
$\frac{-3x^4+7x^2-x+5}{x\:+1}$
$-x^2-7x+1$
$\lim_{x\to0}\left(\frac{e^x-x-cos\left(x\right)}{[sen\left(x\right)]^2}\right)$
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