જો $\cos P = \frac{1}{7}$ અને $\cos Q = \frac{13}{14}$ હોય,જ્યાં $P$ અને $Q$ બંને લઘુકોણ છે,તો $P - Q$ નું મૂલ્ય ....$^o$ છે.

  • A
    $30$
  • B
    $60$
  • C
    $45$
  • D
    $75$

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સાબિત કરો કે $\frac{\cos 4x + \cos 3x + \cos 2x}{\sin 4x + \sin 3x + \sin 2x} = \cot 3x$.

$\cos ^2\left(\frac{\pi}{6}+\theta\right)-\sin ^2\left(\frac{\pi}{6}-\theta\right)$ ની કિંમત શોધો.

જો $\cos (A - B) = \frac{3}{5}$ અને $\tan A \tan B = 2$ હોય,તો

જો $\tan A = \frac{1}{\sqrt{x(x^2+x+1)}}, \tan B = \frac{\sqrt{x}}{\sqrt{x^2+x+1}}$ અને $\tan C = (x^{-3}+x^{-2}+x^{-1})^{\frac{1}{2}}$,જ્યાં $0 < A, B, C < \frac{\pi}{2}$,તો $A+B$ ની કિંમત શું થાય?

$\cos(36^{\circ}-A) \cos(36^{\circ}+A) + \cos(54^{\circ}+A) \cos(54^{\circ}-A) = $

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