∫1cos(x−a)cos(x−b)dx
∫sin(a−b)dxsin(a−b)cos(x−a)cos(x−b)
∫1sin(a−b).sin(x−b)+(a−x)cos(x−a)cos(x−b)dx
1sin(a−b)∫sin(a−b)cos(a−x)+cos(x−b)sin(a−x)cos(x−a)cos(x−b)dx
1sin(a−b)∫tan(x−b)+tan(x−a)dx
1sin(a−b)(logsec(x−b)−logsec(x−a))+C
1sin(a−b)log∣∣cos(x−a)cos(x−b)∣∣+C