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If x Sigma(n=0)^(oo) (-1)^n " tan "^(2...

If ` x Sigma_(n=0)^(oo) (-1)^n " tan "^(2n) " and " y = Sigma_(n=0)^(oo) " cos "^(2n) theta` for ` 0 lt theta lt pi/4`, then :

A

x(1+y) =1

B

x(1 -y) =1

C

y(1-x)=1

D

y(1+x)=1

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