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Math Help - y=asin(bx+c)+d

  1. #1
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    y=asin(bx+c)+d

    One of the questions is
    y=-4sin2(x+pi/2)

    how do i get it into this form
    y=asin(bx+c)+d

    Thanks
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  2. #2
    Eater of Worlds
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    Is that -4sin(2(x+\frac{\pi}{2}))?.

    Sometimes posters will not use ^ for power and write something like x2 for x^2. You do not mean -4sin^{2}(x+\frac{\pi}{2})?.
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  3. #3
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    i double checked the question it is correct
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  4. #4
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    -4sin(2(x+\frac{\pi}{2}))

    If the question really says that it is already in the required form, just expand the brackets to get

    -4sin(2x+\pi)
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