જો $\tan \theta + \sin \theta = m$ અને $\tan \theta - \sin \theta = n$ હોય,તો

  • A
    ${m^2} - {n^2} = 4\,mn$
  • B
    ${m^2} + {n^2} = 4\,mn$
  • C
    ${m^2} - {n^2} = {m^2} + {n^2}$
  • D
    ${m^2} - {n^2} = 4\sqrt {mn}$

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$x \in (0, \pi)$ માટે $\frac{8}{3\sin x - \sin 3x} + 3\sin^2 x \le 5$ હોય તેવી $x$ ની વાસ્તવિક કિંમતોની સંખ્યા કેટલી છે?

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જો $\operatorname{cosec}^2(\alpha+\beta)-\sin^2(\beta-\alpha)+\sin^2(2\alpha-\beta)=\cos^2(\alpha-\beta)$ જ્યાં $\alpha, \beta \in (0, \frac{\pi}{2})$ હોય,તો $\sin(\alpha-\beta)$ ની કિંમત શોધો.

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