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" (fi) "cos(2times30^(@))=(1-tan^(2)30^(...

" (fi) "cos(2times30^(@))=(1-tan^(2)30^(@))/(1+tan^(2)30^(@))

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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^(@))

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

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

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

Prove that : sin(2 times 30^(@))=(2tan30^(@))/(1+tan^(2)30^(@))

Prove that : sin(2 times 30^(@))=(2tan30^(@))/(1+tan^(2)30^(@))