4{ arc tan (1/3) + arc cos ( 2/√5)} = π || INVERSE TRIGONOMETRIC FUNCTIONS
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arc tan (√x)=(1/2) arc cos {(1- x) /(1+ x) } || INVERSE TRIGONOMETRIC FUNCTIONS
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refl4
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A integral trigonométrica mais legal!
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cos{ 2arctan(1/7) }= sin {4arctan(1/3) || INVERSE TRIGONOMETRIC FUNCTIONS
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