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If A=30^(@), verify that (i) sin2A=(2t...

If `A=30^(@)`, verify that
`(i) sin2A=(2tanA)/(1+tan^(2)A)` `(ii) cos2A=(1-tan^(2)A)/(1+tan^(2)A)` `(iii) tan2A=(2tanA)/(1-tan^(2)A)`

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