Nayeli B.
asked • 08/07/16Precalculus
cos 2x= cos x-1
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1 Expert Answer
Kenneth S. answered • 08/07/16
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
I assume the instructions are "solve this equation."
Replace cos 2x by 2 cos2x -1 (one of three versions of double angle formula). You then have a quadratic equation in cos x.
You can take it from there!
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Michael J.
08/07/16