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यदि $A+B+C=2S$ है,तो $\sin(2S-A)+\sin(2S-B)+\sin(2S-C)-\sin(2S) = $

यदि $A + B + C = 180^o$ है,तो $\sum \tan \frac{A}{2} \tan \frac{B}{2} = $

यदि $\sin^2 \theta = \frac{x^2 + y^2 + 1}{2x}$ है,तो $x$ क्या होना चाहिए?

यदि $A + B + C = 180^\circ$ है,तो $\frac{\sin 2A + \sin 2B + \sin 2C}{\cos A + \cos B + \cos C - 1} = $

यदि $A + B + C = \pi$ है,तो $\cos \, 2A + \cos \, 2B + \cos \, 2C = $

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