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" (4) "cos60=(1-tan^(2)30)/(1+tan^(2)30)...

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

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Verify that: sin60o=(2tan30o)/(1+tan^(2)30o)=(sqrt(3))/(2) (ii) cos60o=(1-tan^(2)30o)/(1+tan^(2)30o)=(1)/(2)

Verify that: sin60o=(2tan30o)/(1+tan^2 30o)=(sqrt(3))/2 (ii) cos60o=(1-tan^2 30o)/(1+tan^2 30o)=1/2

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

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

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

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

If A=30^(@) , then prove that : cos2A=cos^(2)A-sin^(2)A " "=(1-tan^(2)A)/(1+tan^(2)A)

If A=30^(@) , then prove that : cos2A=cos^(2)A-sin^(2)A " "=(1-tan^(2)A)/(1+tan^(2)A)