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25 February, 12:28

Tan80+tan70/1-tan80tan70

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  1. 25 February, 13:19
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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

    Merry Christmas
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