Prove that (1-tan^2(pi/4-A))/(1+tan^2(pi...

Prove that `(1-tan^2(pi/4-A))/(1+tan^2(pi/4-A))=sin2Adot`

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`(1-tan^(2)((pi)/(4)-A))/(1+tan^(2)((pi)/(4)-A))=(1-tan^(2)theta)/(1+tan^(2)theta)("where" (pi)/(4)-A=theta)`
`cos 2 theta=cos((pi)/(2)-2A)=sin2A`

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