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20 October, 18:55

Which trigonometric function is equivalent to f (x) = sinx?

f (x) = cos (x-3pi/2)

f (x) = cos (x-pi/2)

f (x) = cos (-x-pi/2) < - - i think this one, not sure

f (x) = cos (x+pi)

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  1. 20 October, 19:00
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    Sin (x) = cos (pi/2 - x)

    cos (y) = cos (-y)

    sin (x) = cos (x - pi/2)

    ... look at unit circle, cos is x, sin is y and examine their relations ... it's easy to find relation from that.
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