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The slope of the tangent line for the curve r=2 cos(3 theta) where theta = pi/6 is.

Sagot :

as you already know, the slope of the tangent line is simply the derivative of the function, so

[tex]r=2cos(3\theta )\implies \cfrac{dr}{d\theta }=2\stackrel{chain~rule}{\left[ -sin(3\theta )\cdot 3 \right]} \\\\\\ \left. \cfrac{dr}{d\theta }=-6sin(3\theta ) \right|_{\theta =\frac{\pi }{6}}\implies -6sin\left( 3\cdot \frac{\pi }{6} \right)\implies -6sin\left( \frac{\pi }{2} \right)\implies -6[/tex]

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