1.

Tan20+tan40+3^1/2.tan20.tan40=?

Answer» TAN60 = (TAN(20+40)
√3 ={ TAN20 + TAN40 }/{1- tan20.tan40}
Tan20 + tan40 = √3 - √3tan20.tan40
Tan20 + tan40 + √3tan20.tan40 = √3


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