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everything to the right of the square root symbol are supposed to be under the square root symbol; x*x=x2

Guest Mar 28, 2017
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We are looking for the sin of a triangle  whose cos  = x  = x  / 1

 

So......the hypotenuse  = 1  = r

 

And the sin  =  sqrt ( r^2 - x^2)  / r   =    sqrt ( 1 - x^2) / 1   =   sqrt (1 - x^2 )

 

 

 

cool  cool cool

CPhill  Mar 28, 2017

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