Trigonometry

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4. Write the equation of the cosine function with an amplitude of 1/3, a period of 2pi, and a phase shift of 3pi/2.

I got 1/3COS(1/2x-3pi), but I really do not think that is correct D: any tips or advice?

  • Trigonometry -

    why the half? cosx already has a period of 2pi.

    1/3 cos(x-3pi/2)

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