Re: Would someone be so kind as to help me with a math equation?
From: Brian Evans (b..evans_at_sympatico.ca)
Date: 01/01/05
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Date: Sat, 1 Jan 2005 00:40:22 -0500
"Dark Alchemist" <GhostOfACPast@gmail.com> wrote in message
news:1104541510.744535.167910@c13g2000cwb.googlegroups.com...
>I am trying to convert a sin into a cos but all I could come up with
> was the half angle formula which does not give me any negatives. The
> half angle formula has the correct number but it loses the sign.
>
> Formula I tried (simplified) was
>
> x=sin(angle)
> y = sqrt(1 - x^2)
>
Some reason you don't just use the inverse trig function for sin?
Usually written as ARCSIN or sin^-1. That would give you:
y = cos(arcsin(x)).
Brian
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