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I was trying to define Taylor like series of functions, when I found out that

 var('x,n')
 sum( diff(sin(x),x,n), n,1,2)

yields 0. I have no idea what the correct syntaxis is. Why doesn't it yield $\cos(x)-\sin(x)$?

I was trying to define Taylor like series of functions, when I found out that

 var('x,n')
 sum( diff(sin(x),x,n), n,1,2)

yields 0. I have no idea what the correct syntaxis is. Why doesn't it yield $\cos(x)-\sin(x)$?

I was trying to define Taylor like series of functions, when I found out that

 var('x,n')
 sum( diff(sin(x),x,n), n,1,2)

yields 0. I have no idea what the correct syntaxis is. Why doesn't it yield $\cos(x)-\sin(x)$?

I was trying to define Taylor like series of functions, when I found out that

 var('x,n')
 sum( diff(sin(x),x,n), n,1,2)

yields 0. I have no idea what the correct syntaxis syntax is. Why doesn't it yield $\cos(x)-\sin(x)$?give `diff(sin(x),x) +diff(sin(x),x,2)' (i.e. $\cos(x)-\sin(x)$)?

I was trying to define Taylor like series of functions, when I found out that

 var('x,n')
 sum( diff(sin(x),x,n), n,1,2)

yields 0. I have no idea what the correct syntax is. Why doesn't it give `diff(sin(x),x) +diff(sin(x),x,2)' (i.e. $\cos(x)-\sin(x)$)?