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  2. List of trigonometric identities - Wikipedia

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

    Trigonometric functions and their reciprocals on the unit circle. All of the right-angled triangles are similar, i.e. the ratios between their corresponding sides are the same.

  3. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    Dividing by interior division Having a line segment ⁠ A B {\displaystyle AB} ⁠ , construct a perpendicular ⁠ B C {\displaystyle BC} ⁠ at point ⁠ B {\displaystyle B} ⁠ , with ⁠ B C {\displaystyle BC} ⁠ half the length of ⁠ A B {\displaystyle AB} ⁠ .

  4. Poisson distribution - Wikipedia

    en.wikipedia.org/wiki/Poisson_distribution

    In probability theory and statistics, the Poisson distribution (/ ˈ p w ɑː s ɒ n /; French pronunciation:) is a discrete probability distribution that expresses the probability of a given number of events occurring in a fixed interval of time if these events occur with a known constant mean rate and independently of the time since the last event. [1]

  5. Quadratic formula - Wikipedia

    en.wikipedia.org/wiki/Quadratic_formula

    The roots of the quadratic function y = ⁠ 1 / 2 ⁠ x 2 − 3x + ⁠ 5 / 2 ⁠ are the places where the graph intersects the x-axis, the values x = 1 and x = 5.They can be found via the quadratic formula.