solve equation: 2arcsinx = arccos(2x+x^2)

determine on easyest way posible the number:

2arctan7 + arctan(31/17).

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- February 22nd 2009, 05:35 AM #1

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- February 22nd 2009, 07:41 AM #2

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- February 22nd 2009, 01:21 PM #3

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