Okay, so I have this reduction formulae question
Establish a reduction formula to find Im,n =∫cos m x . sin n x dx
Prove that (m+n). Im,n = (m-1) . Im-2,n
And okay I solve the problem above, but then the question says
and I can't find the value 8/693 which is the answer in answer key. I'm so confused, what I need to do is just substituting the value right?
But the problem is the I is the integral of ∫cos m x . sin n x dx so what to do with x, do we just put whatever on x, or what?
Please help me ! thanks