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| | Advanced Math: Proving trig identities |
 | | I can answer questions in basic to advanced algebra (theory of equations, complex numbers), precalculus (functions, graphs, exponential, logarithmic, and trigonometric functions and identities), calculus (differentiation, limits, integration, sequences, infinite series), basic probability, and finite mathematics, including mathematical induction. |
 | | The proper technique is to write the identity and then, working on one side at a time, reduce the two sides to the identical expression (hence the term 'identity'). |
 | | Sometimes you do all the work on one side, sometimes you do some work on each side, but you do NOT do things like add, subtract, multiply, divide as if this were an equation to be solved. |
| en.allexperts.com /q/Advanced-Math-1363/Proving-trig-identities-1.htm (997 words) |
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