Sin Alpha Sin Beta 2 Cos Alpha Cos Beta 2

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$If alpha leq 2sin^{-1} x cos^{-1} xleq beta, thenalpha = dfrac {pi}{2}, beta = dfrac {pi}{2}alpha = dfrac {pi}{2}, beta = dfrac {3pi}{2}alpha = 0, beta = pialpha = 0, beta = 2pi$

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