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  2. Mnemonics in trigonometry - Wikipedia

    en.wikipedia.org/wiki/Mnemonics_in_trigonometry

    Signs of trigonometric functions in each quadrant. All Students Take Calculus is a mnemonic for the sign of each trigonometric functions in each quadrant of the plane. The letters ASTC signify which of the trigonometric functions are positive, starting in the top right 1st quadrant and moving counterclockwise through quadrants 2 to 4.

  3. Zaner-Bloser (teaching script) - Wikipedia

    en.wikipedia.org/wiki/Zaner-Bloser_(teaching_script)

    Detail from Zaner's 1896 article: The Line of Direction in Writing [3] A major factor contributing to the development of the Zaner-Bloser teaching script was Zaner's study of the body movements required to create the form of cursive letters when using the 'muscular arm method' of handwriting – such as the Palmer Method – which was prevalent in the United States from the late 19th century.

  4. Spherical trigonometry - Wikipedia

    en.wikipedia.org/wiki/Spherical_trigonometry

    Such polygons may have any number of sides greater than 1. Two-sided spherical polygons—lunes, also called digons or bi-angles—are bounded by two great-circle arcs: a familiar example is the curved outward-facing surface of a segment of an orange. Three arcs serve to define a spherical triangle, the principal subject of this article.

  5. Special right triangle - Wikipedia

    en.wikipedia.org/wiki/Special_right_triangle

    The 30°–60°–90° triangle is the only right triangle whose angles are in an arithmetic progression. The proof of this fact is simple and follows on from the fact that if α, α + δ, α + 2δ are the angles in the progression then the sum of the angles 3α + 3δ = 180°. After dividing by 3, the angle α + δ must be 60°. The right angle ...

  6. 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.

  7. Maps: See how large the California wildfires are - AOL

    www.aol.com/maps-see-large-california-wildfires...

    Multiple major wildfires are leaving a trail of destruction and death in the Los Angeles area.. A handful of wildfires that kicked up on Jan. 7, powered by high winds and dry conditions, have ...

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