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Let x= sum(n=0)^oo (-1)^n (tantheta)^(2n...

Let `x= sum_(n=0)^oo (-1)^n (tantheta)^(2n)` and ` y = sum_(n=0)^oo (costheta)^(2n)` qhere `theta in (0,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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