an identity is an equation that is true for all the allowed values of the variable. Use what you know about trigonometric ratios to show the equation is an identity. tan x = sin x/cos x

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.2: Trigonometric Functions Of Angles
Problem 21E
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an identity is an equation that is true for all the allowed values of the variable. Use what you know about trigonometric ratios to show the equation is an identity.

tan x = sin x/cos x

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