`sec(y) cos(y) = 1` Verfiy the identity.

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Chapter 5, 5.2 - Problem 10 - Precalculus (3rd Edition, Ron Larson).
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Borys Shumyatskiy | College Teacher | (Level 3) Associate Educator

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By definition, `sec(y)=1/cos(y).` Therefore

`sec(y)*cos(y)=[1/cos(y)]*cos(y)=1` , QED.

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