Analytic Trigonometry

2. / a^2 = b^2 + c^2 - 2bc cosA, b^2 = a^2 + c^2 - 2ac cosB, c^2 = a^2 + b^2 - 2ab cosC
8. / the denotation of s in Heron's Formula
9. / 0.5bcsinA, 0.5acsinB, 0.5absinC
10. / ambiguous case
12. / all values of the variable for which both sides of the equation are defined
13. / 0.5(a + b + c)
15. / the set of all such values
16. / graph of a quadratic function
17. / triangle with one angle more than 90 degrees
18. / side, side, side
19. / an identity that relates cosine and co-secant respectively
20. / an identity for a basic trigonometric function f, an identity relating f(x) and f(-x)

1. / solids with faces that are congruent polygons having equal angles and sides
3. / triangle with angles less than 90
4. / an identity; cos^2x + sin^2x = 1, 1 + tan^2x = sec^2x
5. / identity involving a trigonometric function of u/2
6. / created Heron's Theorem
7. / also known as Law of cosines, contains that classic theorem as a special case
11. / an identity;(u + v), (u - v)
14. / states ratio of the sine of an angle to the length of its opposite side