Remy W.

asked • 07/17/19

Use sum-to-product formulas to find the solutions of the equation. (Use n as your arbitrary integer. Enter your answers as a comma-separated list.) cos 5x + cos 7x = cos x

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Victoria V. answered • 07/17/19

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Please see video.

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Andy N.

Very nice video with great explanations for everything. I did catch a quick tiny mistake. When setting the first factor equal to zero, you said cos(x) = 0 implies x = 0, but x is actually π/2 or 3π/2.
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07/18/19

Victoria V.

You are absolutely correct. THANK YOU for finding that mistake. If you were sittig in my class, I would reward you with a piece of candy. :-)
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07/18/19

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