જો $A+B=\frac{\pi}{4}$ હોય,તો $\frac{\cos B-\sin B}{\cos B+\sin B}=$

  • A
    $\sin A$
  • B
    $\cos A$
  • C
    $\tan A$
  • D
    $\cot A$

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જો $\cos 43^{\circ} + \sin 43^{\circ} = k$ હોય, તો $\cos 2^{\circ}$ ની કિંમત શોધો.

જો $\tan \alpha = (1 + 2^{-x})^{-1}$ અને $\tan \beta = (1 + 2^{x+1})^{-1}$ હોય,તો $\alpha + \beta$ ની કિંમત શું થાય?

$\tan 15^\circ = $

જો $\frac{\sin(x+y)}{\sin(x-y)} = \frac{a+b}{a-b}$ હોય,તો $\frac{\tan x}{\tan y} = $

$\cos 20^{\circ} + \cos 30^{\circ} + \cos 40^{\circ} = $

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