Exact solutions of trigonometric equations those in which you leave values like pi or square roots in the answer rather than their decimal approximations.
So, for example, the exact value of sin(60 deg) is sqrt(3)/2, not 0.8660
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The answer will depend on what exactly x represents. With no information about that, the question is pointless.
You can solve for sin18 by making use of trigonometry.
solve it
If you solve such an equation for "y", you get an equation in the slope-intercept form.
you can only solve for one in an equation so it can equal something