$\cos \theta = \frac{b}{\sqrt{a^2 + b^2}}$; जहाँ,$0 < \theta < 90^\circ$; तो $\sin \theta = \dots$

  • A
    $\frac{a}{\sqrt{a^2 + b^2}}$
  • B
    $\frac{a}{b}$
  • C
    $\frac{b}{a}$
  • D
    $\frac{ab}{\sqrt{a^2 + b^2}}$

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