solve it .see attachment
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tan30 = tan (20+10)
1/√3 = tan 30 = tan20 + tan10/1 - tan20 tan 10
1- tan 20 tan 10 = √3(tan20 + tan 10)
√3 tan 20 + √3 tan 10 + tan10 tan20 = 1
option c is correct answer
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