cosx−cosy\cos x-\cos ycosx−cosy
sinx−siny\sin x-\sin ysinx−siny
tanx−tany\tan x-\tan ytanx−tany
sinx−sinycosx+cosy\frac{\sin x-\sin y}{\cos x+\cos y}cosx+cosysinx−siny
secx⋅secytanx−tany\frac{\sec x \cdot \sec y}{\tan x-\tan y}tanx−tanysecx⋅secy