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last two questions...cant understand

ya but last 2

ok so whats the answer for d?

r=(t- 0.5*sin(2t) ) i + (0.5 - 0.5 cos(2 t)) j

is that d???

I think so

ya i gatcyu...so how should i graph that ???

I don't know what graphing tools you have.

wolframalpha

i know upto here but how to plot themm

http://www.wolframalpha.com/input/?i=parametric+plot

thx