Projection Problem

Apr 2010
26
0
Here is a study problem for my final exam tomorrow:
Using the basis
[1, 2(square root 3)t - (square root 3), 6(square root 5)(t^2 - t + 1/6)]
for R3[t] with the L^2[0, 1] inner product,
find the projection of the function sin(pie(x)) onto R3[t].
I am given hints as to what some integrals equal to facilitate the problem, but they are too complicated for me to type out on a computer... i'll try my best:
integral 0 to 1 of tsin(pie(t))dt = 1/pie
and the integral 0 to 1 of t^2sin(pie(t))dt = (pie^2 - 4)/pie^3

thanks in advance for your help!
 

dwsmith

MHF Hall of Honor
Mar 2010
3,093
582
Florida
Here is a study problem for my final exam tomorrow:
Using the basis
[1, 2(square root 3)t - (square root 3), 6(square root 5)(t^2 - t + 1/6)]
for R3[t] with the L^2[0, 1] inner product,
find the projection of the function sin(pie(x)) onto R3[t].
I am given hints as to what some integrals equal to facilitate the problem, but they are too complicated for me to type out on a computer... i'll try my best:
integral 0 to 1 of tsin(pie(t))dt = 1/pie
and the integral 0 to 1 of t^2sin(pie(t))dt = (pie^2 - 4)/pie^3

thanks in advance for your help!
Use Gram-Schmidt.