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OpenStudy (anonymous):
If f(x)=sinx and g(x)=cosx, then the set of all x for which f'(x)=g'(x) is?
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OpenStudy (amistre64):
when does sinx = cosx?
OpenStudy (amistre64):
well, assuming the tick (') is a derivative .... f' = cosx and g' = -sinx
OpenStudy (anonymous):
I think I got it. Is it 3pi/4 + k•pi?
OpenStudy (amistre64):
thats acceptable to me yes. another approach: pi n - pi/4 either one is fine
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