Tan10° - tan50° + tan60° +tan70°
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=tan10 - tan50 + tan60 + tan70
=tan60 + tan(10-50+70)
=√3 + tan30
=√3 + 1/√3
=3+1/√3
=4/√3
=tan60 + tan(10-50+70)
=√3 + tan30
=√3 + 1/√3
=3+1/√3
=4/√3
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