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Tan4theta=cot(2theta+30)....find theta value....pls explain this

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TAN Ф = COT(30+2Ф)

cot(90-Ф) = cot(30+2Ф)        (→tanФ = cot(90-Ф)

90-Ф = 30 + 2Ф

3Ф = 90-30

3Ф=60

Ф= 20



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