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If `log_(10)tan 19^(@) + log_(10) tan 21^(@) + log_(10) tan 37^(@) + log_(10) tan 45^(@) + log_(10) tan 69^(@) + log_(10) tan 71^(@) + log_(10) tan 53^(@) = log_(10) (x)/(2)`, then x = ______. `

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Correct Answer - C
`tan theta . tan (90 - theta) = 1`

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