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OpenStudy (anonymous):
please help explain this trig problem. Solve the equation on the interval [0.2π):12 cos^2x-9=0
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OpenStudy (mertsj):
1. Add 9 to both sides 2. Divide both sides by 12 3. Take the square root of both sides (remember a number has 2 square roots.) 4. Tell the 4 angles between 0 and 2 pi that have the given cosines.
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