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The function d=-8cos2t describes a simple harmonic motion, where d is the distance(in meters) an object travel in t seconds. What is the frequency?

  • trig -

    for any y = a cos(kx) or y = a sin(kx)

    the period is 2π/k

    so for yours the period is 2π/2 = π

    So there is one complete "motion" every π seconds

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