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  2. List of formulae involving π - Wikipedia

    en.wikipedia.org/wiki/List_of_formulae_involving_π

    where C is the circumference of a circle, d is the diameter, and r is the radius.More generally, = where L and w are, respectively, the perimeter and the width of any curve of constant width.

  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...

    Trigonometric functions specify the relationships between side lengths and interior angles of a right triangle. For example, the sine of angle θ is defined as being the length of the opposite side divided by the length of the hypotenuse.

  5. Inverse trigonometric functions - Wikipedia

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

    The solutions to ⁡ = and ⁡ = involve the "plus or minus" symbol , whose meaning is now clarified. Only the solution to cos ⁡ θ = x {\displaystyle \cos \theta =x} will be discussed since the discussion for sec ⁡ θ = x {\displaystyle \sec \theta =x} is the same.

  6. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    The number π (/ p aɪ /; spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics .

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  8. 4 predictions for the US housing market in 2025, according to ...

    www.aol.com/4-predictions-us-housing-market...

    The firm predicts that home prices will rise by 2.6% in 2025, while existing-home sales will notch 4.3 million, up from the 4 million sales it expects this year.

  9. Pythagorean theorem - Wikipedia

    en.wikipedia.org/wiki/Pythagorean_theorem

    Some well-known examples are (3, 4, 5) and (5, 12, 13). A primitive Pythagorean triple is one in which a , b and c are coprime (the greatest common divisor of a , b and c is 1). The following is a list of primitive Pythagorean triples with values less than 100: