given x=2cos(t)+tsin(t) and y=2sin(t)-tcost(t), with t:[pi, 2pi]

find all critical values.

by finding dy/dx and setting it equal to zero, i only find one value, t=6.121, within that domain. that gives you x=.987. I'm suppose to get three other answers. How do i do this?!

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given x=2cos(t)+t*sin(t) and y=2sin(t)-t*cost(t), with t:[pi, 2pi]

given x=2cos(t)+tsin(t) and y=2sin(t)-tcost(t), with t:[pi, 2pi]