anonymous
  • anonymous
Find the period of the function. y = -3 cos x
Mathematics
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
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anonymous
  • anonymous
The period of cosine function is 2π. That doesn't change unless the variable is multiplied by a number. For example if you had y = -3 cos (2x) or y = -3 cos (½x). In those cases the period is 2π divided by the coefficient of x. - For y = -3 cos (2x) the period is 2π ÷ 2 = π. - For y = -3 cos (½x) the period is (2π ÷ ½) = 4π
jim_thompson5910
  • jim_thompson5910
restating what peachpi said the general cosine function is y = A*cos(Bx - C) + D where |A| is the amplitude T = 2pi/B is the period C/B is the phase shift. Positive means right, negative means left y = D is the midline
anonymous
  • anonymous
but there is only cos x so would the period still be 2pi then

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anonymous
  • anonymous
yes
anonymous
  • anonymous
oh okay thank both of your explanations helped i wrote them down
jim_thompson5910
  • jim_thompson5910
In your case, B = 1 making the period T = 2pi/B = 2pi/1 = 2pi

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