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2. Suppose a 'square' of side s on the unit sphere S has every angle equal to 4/5. What is the exact value of cos s? (A 'square' is a regular polygon with four sides.)
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Transcribed Image Text:2. Suppose a 'square' of side s on the unit sphere S has every angle equal to 4/5. What is the exact value of cos s? (A 'square' is a regular polygon with four sides.)
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