Prove the orthogonality relations (28.4) for the trigonometric system. Equation 28.4 (-T,T) cos(jx) cos(kx) dx = (-,)

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Prove the orthogonality relations (28.4) for the trigonometric system.

Equation 28.4

(-T,T) cos(jx) cos(kx) dx = (-,) L  sin (lx) sin(mx) dx = (-TT) 0, , 2, if lm, T, if l=m, cos(kx) sin(x) dx=0

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