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Hello all,
I am trying to calculate the second order of the partial derivative by x of the function:
f(x,y)=(x^2)*tan(xy)
In the attach images you can see my work.
Both the answer in the book where it came from and maple say that the answer is almost correct, but not entirely. In the last fracture in the answer, they say it should be cos(xy)^2, while in my answer is seems to be cos(xy)^3.
I can't figure out what I am doing wrong...
I am attaching also the answer from the book.
Thank you !
I am trying to calculate the second order of the partial derivative by x of the function:
f(x,y)=(x^2)*tan(xy)
In the attach images you can see my work.
Both the answer in the book where it came from and maple say that the answer is almost correct, but not entirely. In the last fracture in the answer, they say it should be cos(xy)^2, while in my answer is seems to be cos(xy)^3.
I can't figure out what I am doing wrong...
I am attaching also the answer from the book.
Thank you !
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