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  2. 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.

  3. Inverse trigonometric functions - Wikipedia

    en.wikipedia.org/wiki/Inverse_trigonometric...

    The most common convention is to name inverse trigonometric functions using an arc- prefix: arcsin(x), arccos(x), arctan(x), etc. [1] (This convention is used throughout this article.) This notation arises from the following geometric relationships: [ citation needed ] when measuring in radians, an angle of θ radians will correspond to an arc ...

  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. Arctangent series - Wikipedia

    en.wikipedia.org/wiki/Arctangent_series

    The derivative of arctan x is 1 / (1 + x 2); conversely, the integral of 1 / (1 + x 2) is arctan x.. If = ⁡ then ⁡ =. The derivative is = ⁡ = + ⁡. Taking the reciprocal, = + ⁡ = +.

  6. Tan-1 - Wikipedia

    en.wikipedia.org/wiki/Tan-1

    tan x1, sometimes interpreted as tan(x1) = tan(⁠ 1 / x ⁠), the tangent of the multiplicative inverse (or reciprocal) of x (see below for ambiguity) tan x1, sometimes interpreted as (tan(x)) −1 = ⁠ 1 / tan(x) ⁠ = cot(x) or cotangent of x, the multiplicative inverse (or reciprocal) of the trigonometric function tangent (see ...

  7. Types of PTSD: From Symptoms to Treatment - AOL

    www.aol.com/types-ptsd-symptoms-treatment...

    Some examples of traumatic experiences that can lead to PTSD: A history of child abuse. Physical abuse. War and military combat. A car accident or some other accident. A natural disaster.

  8. Americans get too much omega-6 and not enough omega-3 ... - AOL

    www.aol.com/lifestyle/americans-too-much-omega-6...

    The National Academy of Medicine recommends that adults get 1.1 to 1.6 grams of omega-3s per day to ensure nutritional adequacy. “Aim for two servings of fatty fish (8 to 12 ounces) each week ...

  9. 2024 Most Memorable Sports Moments: December 26, 2024 - AOL

    www.aol.com/2024-most-memorable-sports-moments...

    Choose your Most Memorable Sports Moment of 2024. Choose between the Kansas City Chiefs winning the Super Bowl, the Summer Olympic Games in Paris, France, or LA Dodgers Shohei Ohtani becoming the ...