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Mathematics
Trinity Joyce
25 February, 12:28
Tan80+tan70/1-tan80tan70
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Kathleen Rich
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
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