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Let P(alpha,beta) and Q(gamma,delta) be ...

Let P`(alpha,beta)` and `Q(gamma,delta)` be two points that lie on the curve `tan^(2)(x+y)+cos^(2)(x+y)+y^(2)+2y=0` in the XY - plane . If the distance between P and Q is d then cos d=

A

0

B

`(-1)^(n), n in N`

C

`+- pi`

D

`+-2npi , n in N`

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The correct Answer is:
B
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