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anonymous
 4 years ago
Hey guys! Problem 1D8a... f(x)=ax+b, x>0 ; f(x)=sin2x, x</=o. What are the values of constants a and b so the function is not differentiable. Trouble when trying to find the derivative f'(0)...
anonymous
 4 years ago
Hey guys! Problem 1D8a... f(x)=ax+b, x>0 ; f(x)=sin2x, x</=o. What are the values of constants a and b so the function is not differentiable. Trouble when trying to find the derivative f'(0)...

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TuringTest
 4 years ago
Best ResponseYou've already chosen the best response.1f'(0)=a=2cos(0)=2 so if a is not =2 it's not differentiable at zero

TuringTest
 4 years ago
Best ResponseYou've already chosen the best response.1plus it's not differentiable if it's not continuous, which is the case for b not=0

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Ok, just saw a topic below and realized and haven't got to the part when I can calculate f'(0), so for me it didn't make sense that f'(x)=2cos(2x)... Just gonna move on and tackle it again later! I got the b part nonetheless... Thanks a lot for the help ;)

TuringTest
 4 years ago
Best ResponseYou've already chosen the best response.1oh yeah, the chain rule is later in the series but there are questions that require it in the beginning. They should fix that :/

TuringTest
 4 years ago
Best ResponseYou've already chosen the best response.1...you could perhaps use a trig formula instead

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0dw:1328490764769:dw dw:1328491513309:dw

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Got it! Thanks a lot :)

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0This is the value of a and b where it is differentiable....are you looking for the values where it is not?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Therefore if a is not equal to 2 or if b is not equal to zero, then the function is not differentiable.
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