જો $\cos A = \frac{7}{25}$ અને $\frac{3 \pi}{2} < A < 2 \pi$ હોય,તો $\cos \frac{A}{4} + \cos \frac{A}{2} - \cos 2A =$

  • A
    $\frac{1}{\sqrt{10}} + \frac{27}{625}$
  • B
    $\frac{3}{\sqrt{10}} - \frac{27}{625}$
  • C
    $\frac{3}{\sqrt{10}} + \frac{27}{625}$
  • D
    $\frac{1}{\sqrt{10}} - \frac{27}{625}$

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$\frac{\sin 3\theta - \cos 3\theta}{\sin \theta + \cos \theta} + 1 = $

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

જો $\tan x = -\frac{4}{3}$ અને $x$ એ બીજા ચરણમાં હોય,તો $\sin \frac{x}{2}, \cos \frac{x}{2}$ અને $\tan \frac{x}{2}$ શોધો.

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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 $a: b=$

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