If tan(x + 40°)tan(x + 20°)tan(3x)tan(70° - x)tan(50° - x) = 1, then the value of x is equal to - CDS Elementary Mathematics 2015 (II)

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If tan(x + 40°)tan(x + 20°)tan(3x)tan(70° – x)tan(50° – x) = 1, then the value of x is equal to