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9.2 Exercise 19

Avg difficulty 2.5

Explain to someone who has forgotten the even-odd properties of sinusoidal functions how the addition and subtraction formulas can determine this characteristic for f(x)=sin(x) f \left(x\right) = \sin \left(x\right) and g(x)=cos(x). g \left(x\right) = \cos \left(x\right) . (Hint: 0−x=−x 0 - x = - x )

OpenStax Algebra and Trigonometry 2e, 9.2 Sum and Difference Identities, exercise 19

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Adapted from College Algebra © 2021 Rice University. Licensed under CC BY 4.0. Sources: College Algebra 2e, Algebra and Trigonometry 2e, Precalculus 2e, College Algebra with Corequisite Support 2e. Imported at revision 4922e46.