Sunday

April 20, 2014

April 20, 2014

Posted by **Anonymous** on Friday, June 22, 2012 at 8:13am.

- Calculus -
**Reiny**, Friday, June 22, 2012 at 8:34amf'(x) = 2cosx + 2sinx(cosx)

= 0 when the tangent is horizontal

2cosx(1 + sinx) = 0

cosx = 0 or sinx = -1

if cosx = 0

x = π/2 or 3π/2

f(π/2) = 2(1) + 1 = 3

f(3π/2) = 2(-1) + 1 = -1

so we have two points,**(π/2 , 3) and (3π/2 , -1)**

if sinx = -1

x = 3π/2 giving us the same point as above

there are two points**(π/2 , 3) and (3π/2 , -1)**

- Calculus -
**Anonymous**, Friday, June 22, 2012 at 10:11pmThanks!!! I was getting the first point wrong!

**Related Questions**

precalculus - analyzethe graph of the function Find the x- and y-intercepts. (b...

math pre calculus - find the following for the function f(x)=(x+5)^2(x-2)^2 a....

Calculus - 55. Find an equation of the tangent line to the graph of f(x) =x^3 - ...

pre calculus - find the following for the function f(x)=(x+3)^2(x-1)^2 a.) find ...

calculus - 4. Given the function f defined by f(x) = cos2x for -π≤ x...

Calculus-Function - sketch the graph of a function in neighborhood x=2 that ...

pre-cal: graphs of functions- fill in the blank - To find the domain of a ...

Calculus - Functions? - #1. A cubic polynomial function f is defined by f(x) = ...

math - Consider the function f(x)= -cos3x -4sin3x. (a)Find the equation of the ...

math - help me ..... Consider the function f(x)= -cos3x -4sin3x. (a)Find the ...