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Math Help - trig equation problem

  1. #1
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    trig equation problem

    The height, h, in metres above the ground of a rider on a Ferris wheel can be modelled by the equation h=10sin(pi/15t-7.5)+12, where t is the time in seconds. At t=0 s, the rider is at the lowest point. Determine the first two times that the rider is 20 m above the ground. Also use a graph to illustrate your solutions.
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  2. #2
    No one in Particular VonNemo19's Avatar
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    sin(x-y) = sin(x)cos(y) - cos(x)sin(y)

    I'm pretty sure that this should help matters a bit. If you need a bigger hint let me know.
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  3. #3
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    Quote Originally Posted by VonNemo19 View Post
    sin(x-y) = sin(x)cos(y) - cos(x)sin(y)

    I'm pretty sure that this should help matters a bit. If you need a bigger hint let me know.
    I have h=(sinpi/15tcos7.5-cospi/15tsin7.5)+12
    Now how does this help me get the answer to this problem?
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