$A$ flexible chain of weight $W$ hangs between two fixed points $A$ & $B$ which are at he same horizontal level. The inclination of the chain with the horizontal at both the points of support is $\theta$ . What is the tension of the chain at the mid point? 

  • A

    $\frac{W}{2}. cosec \theta$

  • B

    $\frac{W}{2} . tan \theta$

  • C

    $\frac{W}{2} cot \theta$

  • D

    none

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