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# AP Calculus BC parametric, vector frq

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• I would like to say that for 2002 BC1 (slide 10 and 11) part c asks for the smallest positive value for t and -π/2 is not positive but the time should be π/6 however your speed is still 2.

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• In my previous post, I am refferring to the 3rd problem.

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• On Part 'C', It appears you have made an algebra error. when going from (9/t^2) = 6 , You cannot just turn the 1/t^2 to t^2. There are two ways to correctly solve at that point Probably the best way to do it would be to multiply both sides by t^2, so you have 6t^2 = 9. Then divide 9 by 6, which gives you 3/2, and then take the square root of 3/2 , which will give you 'radical 3/2' .

I appreciate you posting this, but hopefully you can edit this soon so no unsuspecting student will become confused.

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