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Question: double angle identities in excercises 112 use the double angle...

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DOUBLE ANGLE IDENTITIES:

In excercises 1-12, use the double angle identities to find the indicated values.

#1, 5, 9


Please explain steps.
5.3 Double-Angle Identities 261 SECTION 5.31 EXERCISES . SKIL LS... and cosx < 0, find cos(2x). If sinx T and cosx < 0, find
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