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Prove that cosA-cos2A+2/3sinA-sin2A=1+cosA/sin A
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Molly shared a spool of ribbon with 12 people. each person received 3 feet of ribbon. which equation can she use to find r, the number of feet of ribbon that her spool originally had?
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Prove that cosA-cos2A+2/3sinA-sin2A=1+cosA/sin A...
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