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26 June, 04:36

For what x-value (s) does sin (x) = - 1?

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  1. 26 June, 07:33
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    sin (x) = - 1

    arcsin (-1) = x

    x = - 90

    and multiples of 360

    x = -90, 270, ...

    x = -90 + 360n where n is an integer

    or in radians

    -pi/2 + 2*pi * n where n is an integer
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