If \[2{{\cos }^{-1}}\sqrt{\frac{1+x}{2}}=\frac{\pi }{2},\]then \[x=\]

1.	If \[2{{\cos }^{-1}}\sqrt{\frac{1+x}{2}}=\frac{\pi }{2},\]then \[x=\]
A.	1
B.	0
C.	-0.5
D.	44228
Answer» C. -0.5

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If \[2{{\cos }^{-1}}\sqrt{\frac{1+x}{2}}=\frac{\pi }{2},\]then \[x=\]

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