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Equations with trigonometry in them can look scary, but that's nothing that a quick little substitution can't fix.

Which of the following is equal to \[8\cos x-8\cos (x-60^\circ) ?\]

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by **Brilliant Staff**

What is the value of \[\sin {56}^\circ-\sin {64}^\circ+\sin {176}^\circ ?\]

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by **Brilliant Staff**

examples, and problems from the community.

including olympiad champions, researchers, and professionals.

Sign up to access problem solutions.

by **Brilliant Staff**

examples, and problems from the community.

including olympiad champions, researchers, and professionals.

Sign up to access problem solutions.

by **Brilliant Staff**

examples, and problems from the community.

including olympiad champions, researchers, and professionals.

Sign up to access problem solutions.

by **Brilliant Staff**

© Brilliant 2017

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