Trigonometry

Write the expression as a trigonometric function of only θ, and use a graphing utility to confirm your answer graphically.
cos((9π/2)-θ

  1. 👍 0
  2. 👎 0
  3. 👁 104
asked by Thomas
  1. 9π/2 is the same angle as π/2 (since 9π/2 = π/2+4π)
    we all know that the co- in cosine means "complementary angle" so
    cos(π/2-θ) = sinθ

    Or, you can use the difference of angles formula. Same result.

    1. 👍 0
    2. 👎 0
    posted by oobleck

Respond to this Question

First Name

Your Response

Similar Questions

  1. Pre-Calculus

    1) Use a graphing utility to obtain the graph of the function. Give the domain of the function and identify any vertical or horizontal asymptotes. x+4/ x^2+x-6. 2) Use a graphing utility to graph the function and determine the

    asked by Addy on April 8, 2011
  2. precalculus

    Use the Intermediate Value Theorem and a graphing utility to find intervals of length 1 in which the polynomial is guaranteed to have a zero. Use the root feature of a graphing utility to approximate the zeros of the function.

    asked by janet on December 26, 2010
  3. Pre-Calc

    I am really struggling with how to do these problems, I posted them a few minutes ago but the answers/work shown was incorrect. 1) a) Use an Addition or Subtraction Formula to write the expression as a trigonometric function of

    asked by Alyssa on April 13, 2015
  4. TRIGONOMETRY

    Write the following trigonometric expression as an algebraic expression in x free of trigonometric or inverse trigonometric functions sin(cos^-1 x) -1≤x≤1

    asked by Matthew on December 4, 2012
  5. Pre-Calc

    1) Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number. cos 12° cos 18° − sin 12° sin 18° And Find its exact value. 2) Use an Addition or Subtraction Formula to write the

    asked by Alyssa on April 13, 2015
  6. economics

    Consider a consumer who has an experienced utility function given by . Let denote the market price of good , and assume that it remains fixed throughout the problem. The company selling the good starts an advertisement campagin

    asked by ali on January 22, 2014
  7. economics math

    Consider a consumer who has an experienced utility function given by UEU(x,m)=2sqrtx+m. Let q denote the market price of good x, and assume that it remains fixed throughout the problem. The company selling the good x starts an

    asked by manu on January 20, 2014
  8. precal

    use a right triangle to write the expression as an algebraic expression. assume that x is positive and in the domain of the given inverse trigonometric function. sin(sec^-1 ãx^2+ 25/(x))

    asked by adam2 on March 8, 2010
  9. Pre-Calculus

    Use a graphing utility to graph the function y = d + a sin (bx - c) for different values of a, b, c, and d. Write a paragraph describing the changes in the graph corresponding to changes in each constant.

    asked by Iris on August 14, 2016
  10. Indifference Curves

    For each example below, draw a set of three indifference curves that represent the given preferences. Be certain to show the direction of increasing utility. Also write down a utility function that would be consistent with the

    asked by Stan on August 7, 2009

More Similar Questions