सिद्ध कीजिए cos^(-1) x = 2 cos^(-1) sq...

सिद्ध कीजिए
`cos^(-1) x = 2 cos^(-1) sqrt((1 + x)/(2))`

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The correct Answer is:

`implies cos^(-1) x = 2 cos^(-1) sqrt((1 + x)/(2))`

सिद्ध कीजिए cos^(-1) x = 2 cos^(-1) sqrt((1 + x)/(2))
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cos^(-1)(sqrt(1+cos x)/2)
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