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25 September, 18:09

Without using a calculator how do you evaluate tan 5π/6.

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  1. 25 September, 18:18
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    Remember that pi=180,

    so 180/6=30, 30*5=150,

    what's tan 150?

    Remember that 150 degrees is in the 2nd quadrant, and this is tangent, so it means the answer must be negative, because tan 150 = - tan 30, and - tan30=-√3/3.

    Answer: - √3/3.
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