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Tan80+tan70/1-tan80tan70

Tan80+tan70/1-tan80tan70
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Tan80+tan70/1-tan80tan70

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User Hamed Kamrava
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1 Answer

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We have the formula tan(a+b)= (tana+tanb): (1-tana x tanb)
And now we have a=80, b=70 and
(tan80+tan70): (1-tan80 x tan70)= tan(80+70)= tan150
If you write 70 for 70°, we have tan150°=1/√3
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User Noamtm
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