$\cos a=\csc a.\tan a.\cos^2a$
$a^{\frac{1}{4}}a^{\frac{1}{6}}a^{\frac{-1}{3}}$
$cos^4+2\left(a\right)+sen^22\left(a\right)=cos^22\left(a\right)+sen^42\left(a\right)$
$3y^2=18x^4$
$\frac{\sqrt[2]{1+x^2}}{\left(1+x^2\right)}$
$\frac{d}{dx}\left(\ln\left(\cosh\left(3x\right)\right)\right)$
$\tan\left(x\right)\:.\:\cot\left(x\right)-\cos^2\left(x\right)$
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