Problem 140 of 7
Determine whether f(x)=cos(x) is odd.
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test f(-x)=-f(x) or origin symmetry.
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Function must be testable by f(-x)=-f(x) or origin symmetry.
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Solution
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1. Compute f(-x).
2. Compare it to -f(x).
3. Classify as odd only if they match for all x in the domain.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Claiming a function is odd because it has an odd exponent somewhere.