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" (x) "cos60^(@)=(1-tan^(2)30^(@))/(1+ta...

" (x) "cos60^(@)=(1-tan^(2)30^(@))/(1+tan^(2)30^(@))

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Verify that cos 60^(@)=(1-tan^(2)30^(@))/(1+tan^(2)30^(@))

(2tan30^(@))/(1-tan^(2)30^(@))

Prove that : cos(2 times 30^(@))=(1-tan^(2)30^(@))/(1+tan^(2)30^(@))

Prove that : cos(2 times 30^(@))=(1-tan^(2)30^(@))/(1+tan^(2)30^(@))

(2 tan 30^(@))/(1 + tan^(2)30^(@)) =

(2 tan 30^(@))/(1 + tan^(2)30^(@)) =

Prove (1-sin60^(@))/(cos60^(@))=(1-tan30^(@))/(1+tan30^(@))