To determine the value of tan(7?/8) ,which identity could be used?I.(1 - cos(7?/4))/sin(7?/4)II.sin(7?/4)/(1 - cos(7?/4))III.-{(1...

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To determine the value of tan(7?/8) ,which identity could be used?I.(1 - cos(7?/4))/sin(7?/4)II.sin(7?/4)/(1 - cos(7?/4))III.-{(1 - cos(7?/4))/(1 + cos(7?/4))}^(1/2)a)l onlyb)I and II only

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