જો $\sin x + \cos x = a$,$a \in [-\sqrt{2}, \sqrt{2}] - \{-1, 1\}$,હોય,તો $\sum_{n=1}^\infty (\sin^n x + \cos^n x)$ ની કિંમત શોધો.

  • A
    $\frac{2(1 + a - a^2)}{(a + 1)^2}$
  • B
    $\frac{2(a^2 - a + 1)}{(a - 1)^2}$
  • C
    $\frac{2(a^2 - a + 1)}{(a + 1)^2}$
  • D
    $\frac{2(1 + a - a^2)}{(a - 1)^2}$

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$\cos 24^{\circ} + \cos 55^{\circ} + \cos 155^{\circ} + \cos 204^{\circ}$ નું મૂલ્ય શું છે?

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