# Posts by Mooch

Total # Posts: 8

**Calculus (Derivatives of Inverse Functions)**

Suppose f(x) = sin(pi cos(x)). On any interval where the inverse function y = f^-1(x) exists, the derivative of f^-1(x) with respect to x is: I've come as far as y = arccos ((arcsin(x))/pi), but I am not certain this is right.

*March 15, 2012*

**Calculus Check**

Thank you. From now on, I will include my work for reference. As you can see, I do know (to a degree) what I am doing. However, my practice instructions aren't always very clear on how to carry out these problems so I look for a second opinion to back me up. Again, thank you.

*March 13, 2012*

**Calculus Check**

The region R is bounded by the x-axis, x = 1, x = 3, and y = 1/x^3. Here is what I have so far: Radius = 1/(x^3) Area of Cross Section = pi(1/(x^3))^2 Simplified: pi(1/(x^6)) Volume = (definite integral from 1 to 3) pi(1/(x^6)) dx = pi( -1 / 5(3)^5) - pi(-1 / 5(1)^5) = pi (-1...

*March 13, 2012*

**Calculus (Solid of Revolution)**

Here is what I have so far: Radius = 1/(x^3) Area of Cross Section = pi(1/(x^3))^2 Simplified: pi(1/(x^6)) Volume = (definite integral from 1 to 3) pi(1/(x^6)) = pi( -1 / 5(3)^5) - pi(-1 / 5(1)^5) = pi (-1 / 1215) - pi (-1 / 5) = pi(242 / 1215) = 0.625732858 Sincerely, Mooch

*March 13, 2012*

**Calculus (Volume of Solids)**

This is precisely why I posted, I thought that the wording of this practice problem might make sense to someone else, because it completely confused me. After a lot of thinking, I figured that the solid of revolution was a hemisphere. It was created by rotating the quarter ...

*March 13, 2012*

**math**

awesome! Thank you. OK how about four fives to get 4??

*September 2, 2007*

**math**

tried 22-2x2 =18 22-2+2=18 how do I get to 14

*September 2, 2007*

**math**

show how to use four two's to get the quanity 14

*September 2, 2007*

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