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cos(phi - 1) = cos(phi)cos(1) + sin(phi)sin(1)

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Q: How do you calculate cos phi -1?
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How is the golden ratio worked out?

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How do you prove that (1 plus cotx)2-2cotx 1(1-cos)(1 plus cos)?

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How do you solve sinx divided by 1 plus cosx plus cosx divided by sinx?

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