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Taking theta=30^(@), verify each of the ...

Taking `theta=30^(@)`, verify each of the following
`(i) sin 2theta=2sin theta cos theta`
`(ii) cos theta=2cos^(2)theta-1=1-2sin^(2)theta`
`(iii) tan2theta=(2tantheta)/(1-tan^(2)theta)`

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