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OpenStudy (anonymous):
trying to simplify ... cos ^2 A + Cos A - 12?
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OpenStudy (imstuck):
factor it. Like this: (cos A + 4)(cos A - 3)=0
OpenStudy (imstuck):
Then...cos A = -4, and cos A = 3. Do you have a calculator?
OpenStudy (anonymous):
yes. actually thats weird i never thought of that?... thank you
OpenStudy (anonymous):
You are truly a genious sir. Many thanks
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