The functions cosx and sinx form an orthonormal set in C[-Ï. Ï]. If f(x) = 3 cosx
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f(x) = 3 cosx + 2 sin x and g(x) = cosx - sin x
use Corollary 5.5.3 to determine the value of
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(f, g) = f(x)g(x)dx
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