Use the cofunction identities and odd-even identities to
Chapter 5, Problem 5.1.1.102(choose chapter or problem)
Use the cofunction identities and odd-even identities to prove that \(\cos (\pi-x)=-\cos x\).
[Hint: \(\cos (\pi-x)=\cos (\pi / 2-(x-\pi / 2))\).]
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