ધારો કે $P(\alpha, \beta)$ અને $Q(\gamma, \delta)$ એ $XY$-સમતલમાં વક્ર $\tan^2(x+y) + \cos^2(x+y) + y^2 + 2y = 0$ પર આવેલા બે બિંદુઓ છે. જો $P$ અને $Q$ વચ્ચેનું અંતર $d$ હોય,તો $\cos d =$

  • A
    $1$
  • B
    $(-1)^n, n \in N$
  • C
    $\pm \pi$
  • D
    $\pm 2n\pi, n \in N$

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