Check out these articles for a simple free tool and tutorial that will make trig simple enough for ANYBODY to understand!
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You can solve for sin18 by making use of trigonometry.
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Unlike equations (or inequalities), identities are always true. It is, therefore, not possible to solve them to obtain values of the variable(s).
Through the usage of trigonometry and a protractor.
The answer will depend on what exactly x represents. With no information about that, the question is pointless.