# The position of an object moving along a line is given by #p(t) = 2t - cos(( pi )/4t) #. What is the speed of the object at #t = 7 #?

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To find the speed of the object at t = 7, differentiate the position function with respect to time, and then substitute t = 7 into the derivative.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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