यदि ${x_1}, {x_2}, {x_3}, ..., {x_n}$ एक $A.P.$ में हैं जिनका सार्व अंतर $\alpha$ है,तो $\sin \alpha (\sec {x_1}\sec {x_2} + \sec {x_2}\sec {x_3} + ... + \sec {x_{n - 1}}\sec {x_n}) = $ का मान क्या होगा?

  • A
    $\frac{\sin (n - 1)\alpha}{\cos {x_1}\cos {x_n}}$
  • B
    $\frac{\sin n\alpha}{\cos {x_1}\cos {x_n}}$
  • C
    $\sin (n - 1)\alpha \cos {x_1}\cos {x_n}$
  • D
    $\sin n\alpha \cos {x_1}\cos {x_n}$

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