TRIG

Can someone please help me?

Use identities to find the indicated value for each angle measure.

sin θ = 12/13, cos θ > 0
Find cos (2θ).

  1. 👍 0
  2. 👎 0
  3. 👁 86
asked by Debbie
  1. cos(2θ)
    =cos²(θ)-sin²(θ)
    =(1-sin²(θ))-sin²(θ)]
    =1-2sin²(θ)

    Can you do the rest?

    1. 👍 0
    2. 👎 0
    posted by MathMate

Respond to this Question

First Name

Your Response

Similar Questions

  1. Algebra

    In triangle ABC, the measure of angle B is 8 degrees more than three times the measure of angle A. The measure of angle C is 37 degrees more than the measure of angle A. Find the measure of each angle. What is the measure of angle

    asked by Student on February 18, 2014
  2. geometry

    in an isosceles trapezoid, ABCD, AD congruent BC. diagonal AC bisects angle DAB. if the measure of angle CAB = 15, find: the measure of angle b, measure of angle BCA, measure of ACD, and the measure of angle D

    asked by kyle on May 3, 2016
  3. geometry

    Lines BA and BC are opposite rays, Lines BD bisects angle EBC and Line BF bisects angle ABE. If the measure of angle EBD=4x+16 and the measure of angle DBC=6x+4 find the measure of ange EBD If the measure of angle ABF =7x-8 and

    asked by kd on September 1, 2011
  4. Algebra II

    The measure of the largest angle of a triangle is 90 more than the measure of the smallest angle, and the measure of the remaining angle is 30 more than the measure of the smallest angle. Find the measure of each angle. Show

    asked by Monique on June 9, 2014
  5. algebra.

    problems about angles: Hi. I needed help on some problems for the math section that we are doing in class. I am trying out some problems in my math book, but they prove quite difficult. 1. In a certain parallelogram, if the

    asked by jason on November 15, 2007
  6. algrbra

    Complimentary angles add up to 90º So translate the English into Math. if you let the unknown angle be x then "the measure of the compliment of the angle" -----> 90-x "10 degrees less than three times the measure of the angle"

    asked by Reiny on March 28, 2007
  7. algebra 101

    If The sum of the measures of two complementary angles is 90° and If one angle measures 15° more than twice the measure of its complement, find the measure of each angle. What is The measure of one angle is 1 times the measure

    asked by misty on January 8, 2012
  8. cwi

    The sum of the measures of the angles of any triangle is 180 degrees. In triangle ABC, the measure of angle A is 70° more than the measure of angle B. The measure of angle B is twice the measure of angle C. Find the measure of

    asked by JJd on May 30, 2016
  9. Math

    Find the measure of two complementary angles if the measure of one angle is 30˚ greater than the measure of the other. What is the measure of the larger angle? What is the measure of the smaller angle?

    asked by Elle on February 24, 2018
  10. Algebra

    Could anybody help me with these two problems, or at least the 1st one? Thank you very much. „« The measure of the third angle of a triangle is 38 degrees more than the second angle. The measure of the first angle is two less

    asked by Aria on May 16, 2011
  11. Trigonometry

    I just want to know if this answer is correct, 120/169. Use identities to find the indicated value for each angle measure. sin θ = 12/13, cos θ > 0 Find cos (2θ).

    asked by Shayla on May 1, 2010

More Similar Questions