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Mnemonics for Sine and Cosine Function Values of Special Angles

  1. Draw a table with three columns. Write the angles 0, 30, 45, 60, and 90 (in degrees) on the first column.
  2. Write the integers 0 to 4 in order on the second column, and 4 to 0 on the third column.
  3. Take the square roots of all entries of the second and third columns.
  4. Divide all answers by 2. You should now have the sine and cosine function values of the given angles.

Does this have any geometric interpretation or significance? I don't think this is a coincidence, because virtually everything is related in mathematics.

Note by Francis Gerard Magtibay
1 year, 3 months ago

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