Hello everyone. I need to solve this math problem and it has been giving me lots of trouble. Find all values of t such that r'(t) is parallel to the xy-plane. r(t)=<sqrt(t+1), cos(t), t^4-8t^2> Thanks!
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Originally Posted by palmaas Hello everyone. I need to solve this math problem and it has been giving me lots of trouble. Find all values of t such that r'(t) is parallel to the xy-plane. r(t)=<sqrt(t+1), cos(t), t^4-8t^2> Thanks! The normal vector to the xy-plane is . Whe the normal of the plane is perpenduclar to the vector will be parallel to the plane. So when .
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