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  2. Exact trigonometric values - Wikipedia

    en.wikipedia.org/wiki/Exact_trigonometric_values

    The values of sine and cosine of 30 and 60 degrees are derived by analysis of the equilateral triangle. In an equilateral triangle, the 3 angles are equal and sum to 180°, therefore each corner angle is 60°. Bisecting one corner, the special right triangle with angles 30-60-90 is obtained.

  3. List of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/List_of_trigonometric...

    A formula for computing the trigonometric identities for the one-third angle exists, but it requires finding the zeroes of the cubic equation 4x 3 − 3x + d = 0, where is the value of the cosine function at the one-third angle and d is the known value of the cosine function at the full angle.

  4. Trigonometry - Wikipedia

    en.wikipedia.org/wiki/Trigonometry

    Abu al-Wafa had sine tables in 0.25° increments, to 8 decimal places of accuracy, and accurate tables of tangent values. [16] He also made important innovations in spherical trigonometry [ 17 ] [ 18 ] [ 19 ] The Persian polymath Nasir al-Din al-Tusi has been described as the creator of trigonometry as a mathematical discipline in its own right.

  5. Trigonometric tables - Wikipedia

    en.wikipedia.org/wiki/Trigonometric_tables

    These two starting trigonometric values are usually computed using existing library functions (but could also be found e.g. by employing Newton's method in the complex plane to solve for the primitive root of z N − 1). This method would produce an exact table in exact arithmetic, but has errors in finite-precision floating-point arithmetic

  6. The Best Store-Bought Pumpkin Pies, Ranked Best to Worst - AOL

    www.aol.com/best-store-bought-pumpkin-pies...

    3. Kroger. Crust: 6 out of 10. Filling: 5 out of 10. Size: 40 ounces. Price: $12. If you have a Kroger-owned grocery store near you, its pumpkin pie will do in a pinch, but homemade would be better.

  7. Trigonometric functions - Wikipedia

    en.wikipedia.org/wiki/Trigonometric_functions

    Basis of trigonometry: if two right triangles have equal acute angles, they are similar, so their corresponding side lengths are proportional.. In mathematics, the trigonometric functions (also called circular functions, angle functions or goniometric functions) [1] are real functions which relate an angle of a right-angled triangle to ratios of two side lengths.

  8. Starbucks CEO aims to improve employee relationship after ...

    www.aol.com/finance/starbucks-ceo-aims-improve...

    Its limited-time offerings didn't succeed, and its value perception weakened. US and North American same-store sales dropped 6% in its latest quarter , while adjusted earnings per share plunged 24%.

  9. Terrell K. Crews - Pay Pals - The Huffington Post

    data.huffingtonpost.com/paypals/terrell-k-crews

    The Terrell K. Crews Stock Index From May 2011 to December 2012, if you bought shares in companies when Terrell K. Crews joined the board, and sold them when he left, you would have a -19.6 percent return on your investment, compared to a 6.8 percent return from the S&P 500.