• June 20th 2006, 02:29 AM
nath_quam
What is the gradient of the normal y= 3cos2x where y = 1.5 ??
• June 20th 2006, 05:34 AM
malaygoel
Quote:

Originally Posted by nath_quam
What is the gradient of the normal y= 3cos2x where y = 1.5 ??

$y = 3cos2x$
$1.5=3cos2x$
$cos2x= .5$
Gradient of tangent= $\frac{dy}{dx}=-6sin2x=-6*\sqrt{3}/2$
Gradient of normal= $\frac{-1}{gradient of tangent}=\frac{1}{3\sqrt{3}}$
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