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Math Help - Limit represent the derivative of some fuction.

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    Limit represent the derivative of some fuction.

    At first I thought that it is (a) but then i realized that even if it's derivative it is possible that it wont turn out to be cos. If I am correct this time, the answer should be (c) f(x)=sin(x), a= pie/4
    am i correct? thank you!!!

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  2. #2
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    Quote Originally Posted by greenbee View Post
    At first I thought that it is (a) but then i realized that even if it's derivative it is possible that it wont turn out to be cos. If I am correct this time, the answer should be (c) f(x)=sin(x), a= pie/4
    am i correct?
    No, that not correct.
    The answer is staring you in the face.
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