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  2. Pythagorean trigonometric identity - Wikipedia

    en.wikipedia.org/wiki/Pythagorean_trigonometric...

    Alternatively, the identities found at Trigonometric symmetry, shifts, and periodicity may be employed. By the periodicity identities we can say if the formula is true for −π < θ ≤ π then it is true for all real θ. Next we prove the identity in the range π/2 < θ ≤ π, to do this we let t = θ − π/2, t will now be in the range 0 ...

  3. List of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/List_of_trigonometric...

    All of the right-angled triangles are similar, i.e. the ratios between their corresponding sides are the same. For sin, cos and tan the unit-length radius forms the hypotenuse of the triangle that defines them. The reciprocal identities arise as ratios of sides in the triangles where this unit line is no longer the hypotenuse.

  4. Proofs of trigonometric identities - Wikipedia

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

    There are several equivalent ways for defining trigonometric functions, and the proofs of the trigonometric identities between them depend on the chosen definition. The oldest and most elementary definitions are based on the geometry of right triangles and the ratio between their sides.

  5. Pell number - Wikipedia

    en.wikipedia.org/wiki/Pell_number

    If a right triangle has integer side lengths a, b, c (necessarily satisfying the Pythagorean theorem a 2 + b 2 = c 2), then (a,b,c) is known as a Pythagorean triple. As Martin (1875) describes, the Pell numbers can be used to form Pythagorean triples in which a and b are one unit apart, corresponding to right triangles that are nearly isosceles.

  6. Parseval's identity - Wikipedia

    en.wikipedia.org/wiki/Parseval's_identity

    In mathematical analysis, Parseval's identity, named after Marc-Antoine Parseval, is a fundamental result on the summability of the Fourier series of a function. The identity asserts the equality of the energy of a periodic signal (given as the integral of the squared amplitude of the signal) and the energy of its frequency domain representation (given as the sum of squares of the amplitudes).

  7. FDA may finally ban artificial red food dye from foods - AOL

    www.aol.com/fda-may-finally-ban-artificial...

    The Food and Drug Administration may finally move to ban artificial red food dye, the coloring found in beverages, snacks, cereals and candies. At the Senate Health, Education, Labor and Pensions ...

  8. Savings interest rates today: With rates slipping, here's ...

    www.aol.com/finance/savings-interest-rates-today...

    A high-yield savings account can earn you significantly more interest than a traditional savings account, with digital banks and online accounts offering the strongest rates, passing along ...

  9. Maui Invitational 2024: Bracket, teams, schedule for college ...

    www.aol.com/maui-invitational-2024-bracket-teams...

    Maui Invitational 2024 scores, schedule (This section was updated with new information) All times Eastern. Monday, Nov. 25. Game 1: Memphis 99, UConn 97 Game 2: Michigan State 72, Colorado 56 Game ...

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