જો $\alpha$ અને $\beta$ પ્રથમ ચરણમાં એવા ખૂણાઓ હોય કે જેથી $\tan \alpha = \frac{1}{7}$ અને $\sin \beta = \frac{1}{\sqrt{10}}$,તો $\alpha + 2\beta =$ ($^{\circ}$ માં)

  • A
    $30$
  • B
    $45$
  • C
    $75$
  • D
    $90$

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