What is the gradient of the normal y= 3cos2x where y = 1.5 ??
$\displaystyle y = 3cos2x$Originally Posted by nath_quam
$\displaystyle 1.5=3cos2x$
$\displaystyle cos2x= .5$
Gradient of tangent=$\displaystyle \frac{dy}{dx}=-6sin2x=-6*\sqrt{3}/2$
Gradient of normal=$\displaystyle \frac{-1}{gradient of tangent}=\frac{1}{3\sqrt{3}}$
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