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  2. Small-angle approximation - Wikipedia

    en.wikipedia.org/wiki/Small-angle_approximation

    The red section on the right, d, is the difference between the lengths of the hypotenuse, H, and the adjacent side, A.As is shown, H and A are almost the same length, meaning cos θ is close to 1 and ⁠ θ 2 / 2 ⁠ helps trim the red away.

  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. Trigonometric substitution - Wikipedia

    en.wikipedia.org/wiki/Trigonometric_substitution

    The integral , may be evaluated by letting = ⁡, = ⁡, = ⁡, where > so that =, and / / by the range of arcsine, so that ⁡ and ⁡ = ⁡.. Then

  5. 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.

  6. Wanda Sykes Has Stage 0 Breast Cancer—Here's What That Means

    www.aol.com/wanda-sykes-stage-0-breast-132500441...

    Tan says a person with Stage 0 breast cancer is 99 percent as likely to live at least 5 years after diagnosis as someone without cancer. All you need to do is get tested. All you need to do is get ...

  7. If you’re not happy with your Medicare Advantage plan ... - AOL

    www.aol.com/finance/not-happy-medicare-advantage...

    “The closest eye provider she would want to see is now 25 miles away.” ... points lower than in 2024 on a scale of 0 to 100. ... a colonoscopy than to go through the Medicare shopping ...

  8. Proofs of trigonometric identities - Wikipedia

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

    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°). Referring to the diagram at the right, the six trigonometric functions of θ are, for angles smaller than the right angle:

  9. Sorry, Boomers: These Holiday Traditions Are Disappearing

    www.aol.com/sorry-boomers-holiday-traditions...

    Some time-honored holiday traditions seem to be fading away. Bidding a few of them goodbye makes us feel holly jolly, while others give us more of a blue Christmas vibe.