tan20+tan40+root 3 tan20 tan 40
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we have 20+ 40 = 60
so tan 60 = tan (20+40)
= (tan 20 + tan 40)/(1- tan 20 tan 40)
or tan 60 - tan 60 tan 20 tan 40 = tan 20 + tan 40
or √3 - √3 tan 20 tan 40 = tan 20 + tan 40
or tan 20 + tan 40 + √3 tan 20 tan 40 = √3
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