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cos^(-1)(-1/2)...

`cos^(-1)(-1/2)`

Text Solution

Verified by Experts

The correct Answer is:
`(2pi)/3`
Range of `cos^(-1)` is `[0,pi]`
`therefore cos^(-1)(-1/2)=theta rArr cos theta=-1/2=-cospi/3=cos(pi-pi/3)=cos(2pi)/3`
`rArr theta=(2pi)/3`.
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