tan420+tan300 / 1- tan420 ×tan660
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Tan(360+60)+Tan(360-60)/1-Tan(360+60)(Tan(630+30)
=Tan60-Tan60/1-Tan60×Cot30
=0/1-√3×√3
=0
Tan(360+60)+Tan(360-60)/1-Tan(360+60)(Tan(630+30)
=Tan60-Tan60/1-Tan60×Cot30
=0/1-√3×√3
=0
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