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Choose the correct answer in each of the following questions:
If `2cos 3 theta=1 " then " theta=?`

A

`10^(@)`

B

`15^(@)`

C

`20^(@)`

D

`30^(@)`

Text Solution

Verified by Experts

The correct Answer is:
C
`2cos3theta=1rArr cos3theta=(1)/(2)=cos60^(@)rArr3theta=60^(@)rArr theta=20^(@).`
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