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OpenStudy (anonymous):
Use a calculator to estimate f ' (a) for f(x)=2x cosx and a=pi/4
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OpenStudy (anonymous):
f'(x)=2*cos(x)-2*x*sin(x) Just plug in pi/4
OpenStudy (anonymous):
0.305061004
OpenStudy (anonymous):
carefule to be in radians not degrees
OpenStudy (anonymous):
thank you!
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