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  • 29-10-2016
  • Mathematics
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how do you find an exact value for sin of 40 degrees without using a calculator

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HomertheGenius
HomertheGenius HomertheGenius
  • 04-11-2016
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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