Posted by **Claire** on Saturday, January 9, 2010 at 8:05am.

1) If x = rcos theta and y = r sin theta, show that partial r / partial x = cos theta and find partial theta / partial x.

2) If z = sin theta.sin phi.sin gamma, and z is calculated for the values theta = 30degrees, phi = 45 degrees and gamma = 60degrees, find approximately the change in the value of z if each of the angles theta and gamma is increased by the same small angle alpha degrees, and phi is decreased by 1/2 alpha degrees.

Can someone please show me how to work these out?

## Answer This Question

## Related Questions

- Calculus - I wanted to confirm that I solved these problems correctly (we had to...
- Algebra II - Multiple Choice Which expression is NOT equivalent to 1? (theta) ...
- Trigonometry - Prove the following identities: 1. (tan theta - sin theta)^2 + (1...
- Trigonometry - Prove the following identities: 1. (tan theta - sin theta)^2 + (1...
- Precalculs - I have no idea how to do these type of problems. -------Problem...
- algebra - Can someone please help me do this problem? That would be great! ...
- Algebra II - Which of the following expressions are not equal to 1? A) sin^2 ...
- trigonometry - can you correct the rest for me please? Express each as a ...
- trigonometry - can you correct the rest for me please? Express each as a ...
- trigonomtry - can you correct the rest for me please? Express each as a function...

More Related Questions