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Inline math tests (mathjax plugin)
This is is a test: $a^2 + b^2 = c^2$
This is another test:  (1+2+ dots+n= frac{n(n+1)}{2} )

To display math on its own line, use double dollar signs:
⇒ $$  frac{d}{dx} left(  int_{0}^{x} f(u) ,du right)=f(x) $$
gives: $$  frac{d}{dx} left(  int_{0}^{x} f(u) ,du right)=f(x) $$

or escaped square brackets:
⇒  [  sin A  cos B =  frac{1}{2} left[  sin(A-B)+ sin(A+B)  right]  ]
gives:  [  sin A  cos B =  frac{1}{2} left[  sin(A-B)+ sin(A+B)  right]  ]

Numbered equations:

( tab) If $ hat T_p$ is the complex fourier tranform, the bispectrum (triple correlation) is:  begin{equation}  hat T_{p,q}^{(3)}= hat T_p. hat T_q.  hat T_{-p-q}  end{equation}