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Mathematics 16 Online
OpenStudy (anonymous):

find slope when f (x) = cos x, a = 0

OpenStudy (anonymous):

\[f'(x)=-\sin(x)\] \[f'(0)=-\sin(0)=0\]

OpenStudy (experimentx):

this is a curve, and curves do not have slopes ... instead they have tangent, which is straight line and have slopes ... for x=0, you have tangent with slope 0

OpenStudy (anonymous):

so why does cos have to be -sin?

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