Mia J.

asked • 06/03/21

Rewrite cos(x−2π/3) i im lost this is fustrating


Rewrite cos(x−2π/3) in terms of sin(x) and cos(x)

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Mark M. answered • 06/03/21

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cos(x - 2π/3) = cosxcos(2π/3) + sinx sin(2π/3) = -(1/2)cosx + (√3/2)sinx

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Mia J.

its wrong
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06/03/21

Mark M.

tutor
I used the identity cos(A-B) = cosAcosB + sinAsinB with A = x and B = 2pi/3. I believe that my answer is correct. Why do you say that it is wrong?
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06/03/21

Teiron S.

Your answer is correct. I'm assuming that Mia J. typed your answer incorrectly.
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11/22/22

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