I'm sorry that this is such a small question, but I haven't done Calculus in years. I have to differentiate (t-(t^3)/3) and (t+(t^3)/3). Thanks.
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This depends on if the denominator of the fraction contains the variable with which respect you are differentiating. In your examples this is not the case. Remember the fact that . In both of your examples, pull out the 1/3 in front.
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