Prove that the product of the cosines of angles of a triangle is less than or equal to 1/8.

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The video illustrates step-by-step how to prove that the product of the cosines of angles of a triangle is less than or equal to 1/8.

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The product of the cosines of angles of a triangle
The cosines of angles of a triangle
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consine function is concave in [0, pi/2], so

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