i) Prove that: (1+tan^(2)A)/(1-tan^(2)A)...

i) Prove that: `(1+tan^(2)A)/(1-tan^(2)A) xx (2 cos^(2) A-1)=1`
ii) Prove that:
`(tantheta)/(1+cottheta)+(cottheta)/(1+tantheta) = "cosec"theta.sectheta-1`

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