Analytic Trigonometry

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Across
  1. 3. / the set of all such values
  2. 5. / created Heron's Theorem
  3. 8. / also known as Law of cosines, contains that classic theorem as a special case
  4. 10. / (u + v), (u - v)
  5. 14. / for a basic trigonometric function f, an identity relating f(x) and f(-x)
  6. 17. / identity involving a trigonometric function of u/2
  7. 19. / 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. 20. / the denotation of s in Heron's Formula
Down
  1. 1. / cos^2x + sin^2x = 1, 1 + tan^2x = sec^2x
  2. 2. / ambiguous case
  3. 4. / states ratio of the sine of an angle to the length of its opposite side
  4. 6. / graph of a quadratic function
  5. 7. / 0.5(a + b + c)
  6. 9. / all values of the variable for which both sides of the equation are defined
  7. 11. / an identity that relates cosine and co-secant respectively
  8. 12. / 0.5bcsinA, 0.5acsinB, 0.5absinC
  9. 13. / solids with faces that are congruent polygons having equal angles and sides
  10. 15. / triangle with one angle more than 90 degrees
  11. 16. / side, side, side
  12. 18. / triangle with angles less than 90