I have this homework question, and I don't quite understand it. Can you please help me ?1. Find an equation of a line(s) that is tangent to the curve f(x)=2cos3x and whose slope is a minimum on the interval (0.2(pie))

Printable View

- Jun 11th 2012, 06:09 PMcleobellaFinding an equation to a line
I have this homework question, and I don't quite understand it. Can you please help me ?1. Find an equation of a line(s) that is tangent to the curve f(x)=2cos3x and whose slope is a minimum on the interval (0.2(pie))

- Jun 11th 2012, 06:29 PMHallsofIvyRe: Finding an equation to a line
I presume you know that the slope of the tangent line to a curve, at a specific point, is the derivative of the function at that point. The derivative here is f'(x)= -6sin(3x). On the interval from 0 to $\displaystyle 2\pi$, -sin(x) has minimum value of -1 at $\displaystyle x= \pi/6$ and $\displaystyle x= 5\pi/6$ so the minimum slope of a tangent line to this curve is -6 at $\displaystyle x= \pi/6$ and $\displaystyle x= 6\pi/6$. Use either one of those to find

**an**equation of a tangent line.