व्यंजक $(sinx + cosecx)^2 + (cosx + secx)^2 - (tanx + cotx)^2$ का मान,जहाँ भी परिभाषित हो,किसके बराबर है?

  • A
    $0$
  • B
    $5$
  • C
    $7$
  • D
    $9$

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जब $\theta = 45^{\circ}$ हो, तो $(\sec \theta + \operatorname{cosec} \theta)$ का मान क्या होगा ($\sqrt{2}$ में)?

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