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Armed with the formulas you have been studying, you
"additional" formulas. Let's take a shot at it!
For example, the double angle formulas are not restricted to
angles whose values are represented only by
Any double combination is valid.
For the first two problems, simplify
the formula further so that the right hand side contains only
For the third problem, armed with the
double angle and sum formulas, verify that this formula is true.
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