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Prove that (i) cos(π4+x)+ cos(π4−x) = √2 cos x (ii) cos(3π4+x)− cos(3π4−x) =− √2 sin x |
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Answer» Prove that (i) cos(π4+x)+ cos(π4−x) = √2 cos x (ii) cos(3π4+x)− cos(3π4−x) =− √2 sin x |
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