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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. 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 ...

4. 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 ...

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   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 ...

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

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   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.

7. Law of cosines - Wikipedia

   en.wikipedia.org/wiki/Law_of_cosines

   Fig. 1 – A triangle. The angles α (or A), β (or B), and γ (or C) are respectively opposite the sides a, b, and c.. In trigonometry, the law of cosines (also known as the cosine formula or cosine rule) relates the lengths of the sides of a triangle to the cosine of one of its angles.