The question says:
Given y = xsinx, prove that y" + y' = 2cosx.
I found that y' = sinx + xcosx, and y" = 2cosx - xsinx.
But I cannot figure out how to simplify (2cosx - xsinx) + (sinx + xcosx) so that it equals 2cosx.
Help?
Jeannine
The question says:
Given y = xsinx, prove that y" + y' = 2cosx.
I found that y' = sinx + xcosx, and y" = 2cosx - xsinx.
But I cannot figure out how to simplify (2cosx - xsinx) + (sinx + xcosx) so that it equals 2cosx.
Help?
Jeannine