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Math Help - cosine thing

  1. #1
    Junior Member rednest's Avatar
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    cosine thing

    Given that x takes a value near \frac{\pi}{2}, explain why cosx = \frac{\pi}{2}-x
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  2. #2
    Moo
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    Hello,

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

    pi/2-x is near 0, because x is near pi/2

    We know that sin(y) ~ y when y is near 0.

    Hence cos(x) ~ pi/2-x
    Last edited by Moo; April 5th 2008 at 07:24 AM.
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