$1-\sin^2\left(2x\right)=1+\frac{1}{2}\sec x\csc x$
$g-1-6-10g$
$\lim_{x\to\infty\:}\left(\frac{x+1}{x}\right)^{3x}$
$\sqrt{x}=3$
$\frac{dy}{dx}=\frac{senx}{y}$
$\left(x^2n-y^{n-1}\right)^2$
$2x^2+2\left(3x-2y^3\right);\:x=2;\:y=-1$
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