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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. Angle trisection - Wikipedia

    en.wikipedia.org/wiki/Angle_trisection

    Then by the triple-angle formula, cos ⁠ π / 3 ⁠ = 4x 3 − 3x and so 4x 3 − 3x = ⁠ 1 / 2 ⁠. Thus 8x 3 − 6x − 1 = 0. Define p(t) to be the polynomial p(t) = 8t 3 − 6t − 1. Since x = cos 20° is a root of p(t), the minimal polynomial for cos 20° is a factor of p(t). Because p(t) has degree 3, if it is reducible over by Q then ...

  4. Actuarial notation - Wikipedia

    en.wikipedia.org/wiki/Actuarial_notation

    Actuarial notation is a shorthand method to allow actuaries to record mathematical formulas that deal with interest rates and life tables.. Traditional notation uses a halo system, where symbols are placed as superscript or subscript before or after the main letter.

  5. 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°). Referring to the diagram at the right, the six ...

  6. Spherical trigonometry - Wikipedia

    en.wikipedia.org/wiki/Spherical_trigonometry

    Case 3: two sides and an opposite angle given (SSA). The sine rule gives C and then we have Case 7. There are either one or two solutions. Case 4: two angles and an included side given (ASA). The four-part cotangent formulae for sets (cBaC) and (BaCb) give c and b, then A follows from the sine rule. Case 5: two angles and an opposite side given ...

  7. Life insurance death benefits - AOL

    www.aol.com/finance/life-insurance-death...

    Life insurance offers more than just peace of mind — it provides critical financial protection for your loved ones when they need it most. At the heart of every policy is the death benefit, the ...

  8. Accidental death & dismemberment (AD&D) insurance - AOL

    www.aol.com/finance/accidental-death...

    Accidental death and dismemberment (AD&D) insurance provides coverage if you lose a limb or your death is the result of an accident. Between AD&D and term life, term life covers more causes of death.

  9. Morrie's law - Wikipedia

    en.wikipedia.org/wiki/Morrie's_law

    The inner angles of the nonagon equal and furthermore = =, = = and = = (see graphic). Applying the cosinus definition in the right angle triangles B F M {\displaystyle \triangle BFM} , B D L {\displaystyle \triangle BDL} and B C J {\displaystyle \triangle BCJ} then yields the proof for Morrie's law: [ 2 ]

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