Thread: help with solving a half angle identity

Im not exactly sure how the square root of 1-(-1/3)/2 = the square root of 2/3?

Can someone explain this for me?

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P.S. Please use brackets where they're needed, what you posted looks lke ...

so you go from \sqrt{\frac{\frac{4}{3}}{2}} to \displaystyle = \sqrt{\frac{2}{3}} by multiplying the 2 by the 3 and leaving the 4 ontop?

i think i understand, you dont know how much i appreshiate the help !