$\frac{sin\left(x\right)+cos\left(x\right)}{1+cot\left(x\right)}=sin\left(t\right)$
$\int\frac{1}{\left(3x+6\right)^4}dx$
$36^{2}-12x+1$
$2x^2+x-2=0$
$2 x - 7 ( 2 x + 7 )$
$\frac{\left(cos\:x\:-\:cos\:x.\:sen\:x\:+\:cos\:x\:\left(1+\:sen\:x\right)\right)}{1\:-\:sen^2\:x}$
$\frac{-x^2-y^2}{-x+y}$
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