posted by .

Find minimum value of 2cos x + 2cos y

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Trig

    Verify the identity: tanx(cos2x) = sin2x - tanx Left Side = (sinx/cosx)(2cos^2 x -1) =sinx(2cos^2 x - 1)/cosx Right Side = 2sinx cosx - sinx/cosx =(2sinxcos^2 x - sinx)/cosx =sinx(2cos^2 x -1)/cosx = L.S. Q.E.D.
  2. Trigonometry

    Need help solving problems using the Trigonometric Identities: 8cos^4 thet=cos4theta+4cos2theta+3 I am a bit unsure how to solve it. I am aware that the first step I must take is to simplify the problem and then use the Product to …
  3. math

    cosA= 5/9 find cos1/2A are you familiar with the half-angle formulas?
  4. Math - Solving Trig Equations

    What am I doing wrong? Equation: sin2x = 2cos2x Answers: 90 and 270 .... My Work: 2sin(x)cos(x) = 2cos(2x) sin(x) cos(x) = cos(2x) sin(x) cos(x) = 2cos^2(x) - 1 cos(x) (+/-)\sqrt{1 - cos^2(x)} = 2cos^2(x) - 1 cos^2(x)(1 - cos^2(x))
  5. Calculus

    If √2cos(x)-1 = (1+√3)/2 and √2cos(x)+1 = (1-√3)/2, find the value of cos4x.
  6. trig

    I don't understand this. can you please tell how you got each answer?
  7. trig

    2cos^2 22.5-1 (find exact value)
  8. trig

    Find minimum value of 2cos x + 2cos y
  9. trig

    Find minimum value of 2cos x + 2cos y
  10. Math

    Determine the solution of the equetion: 2cos x-1=0?

More Similar Questions