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Solve: 1 A-cotA - 1sinA = 1sinA - 1 A+cotA
Integration by substitution, using $x=\csc(\theta)$ - Mathematics Stack Exchange
Cycling - Tour De France 2001 - Prologue - Cote D'Opale, France - 7/7/01 Francisco Cereza - CSC-Tiscali Team Mandatory Credit: Action Images / Tom Able-Green Stock Photo - Alamy