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Find sin""(x)/(2),cos""(x)/(2)andtan""(x...

Find `sin""(x)/(2),cos""(x)/(2)andtan""(x)/(2)` in each of the following.
`cosx=-(1)/(3),x` in quadrant III.

Text Solution

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The correct Answer is:
`(sqrt6)/( 3),-(sqrt3)/(3), -sqrt2`
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