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  2. Exact trigonometric values - Wikipedia

    en.wikipedia.org/wiki/Exact_trigonometric_values

    While trigonometric tables contain many approximate values, the exact values for certain angles can be expressed by a combination of arithmetic operations and square roots. The angles with trigonometric values that are expressible in this way are exactly those that can be constructed with a compass and straight edge , and the values are called ...

  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 of a tetrahedron - Wikipedia

    en.wikipedia.org/wiki/Trigonometry_of_a_tetrahedron

    The following are trigonometric quantities generally associated to a general tetrahedron: The 6 edge lengths - associated to the six edges of the tetrahedron.; The 12 face angles - there are three of them for each of the four faces of the tetrahedron.

  5. Proofs of trigonometric identities - Wikipedia

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

    The sign of the square root needs to be chosen properly—note that if 2 π is added to θ, the quantities inside the square roots are unchanged, but the left-hand-sides of the equations change sign. Therefore, the correct sign to use depends on the value of θ. For the tan function, the equation is:

  6. Florida's Todd Golden coaches in win over Grambling after ...

    www.aol.com/sports/floridas-todd-golden-coaches...

    Florida’s men’s basketball team beat Grambling State on Monday night with Todd Golden on the sidelines in his normal head-coaching role. Golden is continuing as the Gators head coach despite a ...

  7. A Wave Of Violence Sweeps Iraq - data.huffingtonpost.com

    data.huffingtonpost.com/2013/12/a-wave-of...

    The death toll in Iraq this year ranges from some 7,900 to 8,700 people so far, making 2013 the most deadly year for the country since 2008, according to IraqBodyCount.org, a U.K.-based website founded in 2003 and run by volunteers to record civilian deaths.

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

    www.aol.com/pregnant-indiana-woman-25-missing...

    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 ...

  9. Why did Bill Belichick go to North Carolina? New UNC coach ...

    www.aol.com/why-did-bill-belichick-north...

    At his introductory press conference on Thursday, the new Tar Heels coach gave the reasons why he decided to make the jump to college football.