4.8    Trigonometric Equations

INTRODUCTION In Sections 4.5 and 4.6 we considered trigonometric identities, which are equations involving trigonometric functions that are satisfied by all values of the variable for which both sides of the equality are defined. In this section we examine conditional trigonometric equations, that is, equations that are true for only certain values of the variable. We discuss techniques for finding those values of the variable (if any) that satisfy the equation.

We begin by considering the problem of finding all real numbers x that satisfy Images. Interpreted as the x-coordinates of the points of intersection of the graphs ...

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