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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. Proofs of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/Proofs_of_trigonometric...

    For example, the sine of angle θ is defined as being the length of the opposite side divided by the length of the hypotenuse. The six trigonometric functions are defined for every real number , except, for some of them, for angles that differ from 0 by a multiple of the right angle (90°).

  5. Small-angle approximation - Wikipedia

    en.wikipedia.org/wiki/Small-angle_approximation

    The sine and tangent small-angle approximations are used in relation to the double-slit experiment or a diffraction grating to develop simplified equations like the following, where y is the distance of a fringe from the center of maximum light intensity, m is the order of the fringe, D is the distance between the slits and projection screen ...

  6. Trigonometry of a tetrahedron - Wikipedia

    en.wikipedia.org/wiki/Trigonometry_of_a_tetrahedron

    Since there are four such triangles, there are four such constraints on sums of angles, and the number of degrees of freedom is thereby reduced from 12 to 8. The four relations given by the sine law further reduce the number of degrees of freedom, from 8 down to not 4 but 5, since the fourth constraint is not independent of the first three ...

  7. Pregnant Indiana Woman, 25, Has Been Missing for More Than a ...

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    More than a month after Emma Baum went missing, her family is still looking for answers. The 25-year-old woman was last seen on Oct. 10 in Gary, Indiana, on 25th Avenue and Connecticut Street, ABC ...

  8. Only Washington D.C. could view the underdog story of the ...

    www.aol.com/sports/only-washington-d-c-could...

    Tuberville understands that part. Alabama, Ohio State, Georgia and so on ran everything. The Indianas of the world hoped to win six games and reach the Fosters Farm Bowl.

  9. These are the top 100+ gifts of 2024, according to Amazon - AOL

    www.aol.com/lifestyle/top-100-gifts-2024-amazon...

    YETI Boomer 4, Stainless Steel, Non-Slip Dog Bowl Nearly 5,000 dog owners swear by Yeti's dog bowl, which comes in a full rainbow of colors. It's perfect for the outdoors and travel days, as it's ...