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यदि sin 90^(@)""(2 tan theta)/(1+tan^(2)...

यदि `sin 90^(@)""(2 tan theta)/(1+tan^(2)theta)` तब `tan 2 theta=(2tan theta)/(1+tan^(2)theta)` का प्रयोग करके `theta ` का मान ज्ञात कीजिए.

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