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If tan20^(@) = lambda then show that (ta...

If `tan20^(@) = lambda` then show that `(tan 160^(@) -tan 110^(@))/(1+tan160^(@).tan110^(@)) = (1-lambda^2)/(2lambda)`.

A

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

B

`(1+lambda^(2))/(2lambda)`

C

`(1-lambda)/(2lambda)`

D

`(1+ lambda)/(2lambda)`

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A
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