1. find dr/d (theta)
2.Let x and y be differentiable functions of t, and let s=sqrt(5x^2+y^2) be functions of x and y.
a. How is ds/dt related if y is constant
b. how is ds/dt related to dx/dt and dy/dt if neither x nor y is constant
ds/dt= ? dx/dt+?dy/dt
c.How is dx/dt related to dy/dt if s is constant
HAVE NO IDEA AND NEED HELP, PLEASE AND THANK YOU