- #1
smell5
- 9
- 0
Basically I have answered a question using the integration by parts formulae to work out the centre of gravity inside a fan blade using :-
v.du/dx = v.u - u. dv/dx with the integral limits of 0 ==> 20
when v = x then dv/dx =1
when du/dx = 0.3 sinx then u = 0.3cos x
and sub this into the equation to get x(0.3sinx) = x(0.3cosx) - 0.3cosx(1)
Can anyone see any issue with this because he's marked it wrong?
v.du/dx = v.u - u. dv/dx with the integral limits of 0 ==> 20
when v = x then dv/dx =1
when du/dx = 0.3 sinx then u = 0.3cos x
and sub this into the equation to get x(0.3sinx) = x(0.3cosx) - 0.3cosx(1)
Can anyone see any issue with this because he's marked it wrong?