1.

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=0in the XY - plane . If the distance between P and Q is d then cos d=

Answer»

0
`(-1)^(n), n in N`
`+- pi`
`+-2NPI , n in N`

ANSWER :B


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