જો $f(\theta) = \cos \theta_1 \cdot \cos \theta_2 \cdot \cos \theta_3 \cdots \cos \theta_n$ હોય,તો $\tan \theta_1 + \tan \theta_2 + \tan \theta_3 + \cdots + \tan \theta_n =$
- A$\frac{-f^{\prime}(\theta)}{f(\theta)}$
- B$\frac{f^{\prime}(\theta)}{f(\theta)}$
- C$\frac{-f^{\prime \prime}(\theta)}{f^{\prime}(\theta)}$
- D$\frac{f^{\prime \prime}(\theta)}{f^{\prime}(\theta)}$
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