Can someone give a more intuitive explanation on how it is (if it is true), that;(adsbygoogle = window.adsbygoogle || []).push({});

∫_{all}cos (nx) cos (mx) = 0 if n!=m

or

∫_{all}sin (nx) sin (mx) = 0 if n!=m

thanks

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# Orthogonality of cosine and sine functions

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