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Find the vlaue of theta if 2cos3theta=1a...

Find the vlaue of `theta` if `2cos3theta=1and0^(@)ltthetalt90^(@)`.

Text Solution

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`2cos3theta=1`
`rArrcos3theta=(1)/(2)`
`rArr cos3theta=cos60^(@)`
`rArr3theta=60^(@)`
`rArrtheta=20^(@)`
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