यदि $\frac{\cos x}{a} = \frac{\cos (x + \theta)}{b} = \frac{\cos (x + 2\theta)}{c} = \frac{\cos (x + 3\theta)}{d}$ है,तो $\left( \frac{a + c}{b + d} \right)$ का मान क्या होगा :-

  • A
    $\frac{a}{d}$
  • B
    $\frac{c}{d}$
  • C
    $\frac{b}{c}$
  • D
    $\frac{d}{a}$

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एक धनात्मक पूर्णांक $n$ के लिए,मान लीजिए ${f_n}(\theta ) = \left( {\tan \frac{\theta }{2}} \right)\,(1 + \sec \theta )\,(1 + \sec 2\theta )\,(1 + \sec 4\theta ) \dots (1 + \sec {2^n}\theta ).$ तो

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