SOLUTION: How do you solve the following: sin square (4pi/9) - cos square (4pi/9)

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Question 388966: How do you solve the following:
sin square (4pi/9) - cos square (4pi/9)
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
You can't solve it; it's not an equation.
Cheers,
Stan H.