જો $\left(\frac{\sin 3 \theta}{\sin \theta}\right)^2-\left(\frac{\cos 3 \theta}{\cos \theta}\right)^2=a \cos b \theta$ હોય,તો $a: b=$

  • A
    $4: 1$
  • B
    $8: 1$
  • C
    $3: 2$
  • D
    $2: 1$

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જો $\cot A=\frac{11}{60}$,$\cos B=\frac{7}{25}$ અને $A$ કે $B$ બંનેમાંથી કોઈ પણ પ્રથમ ચરણમાં ન હોય,તો $\left(A+\frac{B}{2}\right)$ કયા ચરણમાં આવે છે?

જો $2 \cos \theta = x + \frac{1}{x}$ હોય,તો $2 \cos 3 \theta = $

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$\sqrt{\frac{1 - \sin A}{1 + \sin A}} = $

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