જો $\tan A + \tan B = x$ અને $\cot A + \cot B = y$ હોય,તો $\tan (A + B) =$

  • A
    $\frac{xy}{x-y}$
  • B
    $\frac{xy}{y-x}$
  • C
    $\frac{xy}{x+y}$
  • D
    $\frac{x-y}{xy}$

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Similar Questions

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

સાબિત કરો કે $\cos \left(\frac{3 \pi}{4}+x\right)-\cos \left(\frac{3 \pi}{4}-x\right)=-\sqrt{2} \sin x$.

સાબિત કરો કે: $(\cos x+\cos y)^{2}+(\sin x-\sin y)^{2}=4 \cos ^{2} \frac{x+y}{2}$

જો $\cos \theta = \frac{8}{17}$ અને $\theta$ એ $1^{st}$ ચરણમાં હોય,તો $\cos (30^\circ + \theta) + \cos (45^\circ - \theta) + \cos (120^\circ - \theta)$ ની કિંમત શોધો.

જો $(1 + \tan \theta )(1 + \tan \phi ) = 2$ હોય,તો $\theta + \phi = \dots ^\circ$

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