For every positive number a the functions sin x and cos x are orthogonal on the interval [−a, a]. true or false ?

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.2: Trigonometric Equations
Problem 104E
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q.19 For every positive number a the functions sin x and cos x are orthogonal on the interval [−a, a]. true or false ? 

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