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Let n and k be integers. Prove the following (almost) orthogonality relations: (a) sin(kx) cos(nx)dx = 0 - TT (b) 0 k + In cos(kx

Let n and k be integers. Prove the following (almost) orthogonality relations: (a) sin(kx) cos(nx)dx = 0 - TT (b) 0 k + In cos(kx ) cos(nx) dx = k =In#0 TT 27 k = n = 0

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