यदि $\cos x + \cos^2 x = 1$ है,तो $\sin^2 x + \sin^4 x$ का मान क्या होगा?

  • A
    $1$
  • B
    $-1$
  • C
    $0$
  • D
    $2$

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यदि $A + B + C = 180^o$ है,तो $\cot \frac{A}{2} + \cot \frac{B}{2} + \cot \frac{C}{2}$ का मान क्या होगा?

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