TRIGONOMETRIC EQUATIONS Solving Equations (Page 1 of 11)

One method of solving a trigonometric equation graphically is to set the equation equal to zero, then define the left side of the equation as a function. The solutions to the equation will be the zeros (x-intercepts) of the function. Since these values will represent the measure of angles, the results will depend upon the current mode.

Let's solve 2cosx = -1 using this method and have the results given in radians. First make sure the calculator is in Radian and function (Func) mode.

 MODE key. [Radian] ENTER key. [Func] ENTER key. Calculator screen image.
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