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find the tangential ocmponent of acceleration r(t)=acos(wt)i + bsin(wt) j at t=0 I found normal component...

find the tangential ocmponent of acceleration r(t)=acos(wt)i + bsin(wt) j at t=0 I found normal component to be aw^2 tangential component should be 0 I a m having trouble with this

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