यदि $\sin A = \frac{1}{\sqrt{10}}$ और $\sin B = \frac{1}{\sqrt{5}}$,जहाँ $A$ और $B$ धनात्मक न्यून कोण हैं,तो $A + B = $

  • A
    $\pi$
  • B
    $\pi/2$
  • C
    $\pi/3$
  • D
    $\pi/4$

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