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11 December, 12:38

How do you find an exact value for sin of 40 degrees without using a calculator

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  1. 11 December, 13:02
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    Sin 40° + sin 130° + sin 220° + sin 310° = ...

    sin 130° = sin 50°;

    sin 220° = - sin 40°;

    sin 310° = - sin 50°

    ... = sin 40° + sin 50° - sin 40° - sin 50° = 0

    Answer: 0.
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