Tofi I then prove ula\cos ^{-1} x+\cos ^{-1} y+\cos ^{-1} y+\cos ^{-1} – InterviewSolution

1.	Tofi I then prove ula\cos ^{-1} x+\cos ^{-1} y+\cos ^{-1} y+\cos ^{-1} 2=\pi
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