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reynad
 one year ago
given f(x)=sinx and g(x)=x^2+1, what is f(g(x)) and g(f(x))?
reynad
 one year ago
given f(x)=sinx and g(x)=x^2+1, what is f(g(x)) and g(f(x))?

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jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2\[\Large f(x) = \sin(x)\] \[\Large f(\color{red}{x}) = \sin(\color{red}{x})\] \[\Large f(\color{red}{g(x)}) = \sin(\color{red}{g(x)})\] Do you see how I replaced every x with g(x)?

reynad
 one year ago
Best ResponseYou've already chosen the best response.0that means you would end up with f(g(x))=sin^2x + 1 and using that, g(f(x)) = sin^2x+1 right?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2well we replace the g(x) on the right side with x^2 + 1

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2so let me write out the full steps \[\Large f(x) = \sin(x)\] \[\Large f(\color{red}{x}) = \sin(\color{red}{x})\] \[\Large f(\color{red}{g(x)}) = \sin(\color{red}{g(x)})\] \[\Large f(\color{red}{g(x)}) = \sin\left(\color{red}{x^2+1}\right)\]

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2As for the other way around, it looks like you got it \[\Large g(x) = x^2 + 1\] \[\Large g(f(x)) = (f(x))^2 + 1\] \[\Large g(f(x)) = (\sin(x))^2 + 1\] \[\Large g(f(x)) = \sin^2(x) + 1\]

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2no you cannot distribute like that

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2`sin(x+1)` does NOT turn into `sin(x) + sin(1)`

reynad
 one year ago
Best ResponseYou've already chosen the best response.0wait, so, sin(x^2 +1) cannot be simplified anymore?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2yeah it's as simplified as it gets
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