Verify the identity 2{{ cos }^3}x- cos x=(({{ cos }^2}x-{{ sin }^2}x))/( sec x)
Question: Verify the identity \(2{{\cos }^{3}}x-\cos x=\frac{\left( {{\cos }^{2}}x-{{\sin }^{2}}x \right)}{\sec x}\)
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Solution Format: Word Document
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