Sum and Difference Identities
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0
cos(40)cos(50)-sin(40)sin(50)
(√6-√2)/4
cos(5pi/12)
(√2)-√6)/4
cos(7pi/12)
-1
cos(87)cos(93)-sin(87)sin(93)
-√3/2
sin(40)cos(160)-cos(40)sin(160)
(√6+√2)/4
sin(75)
-2-√3
tan(7pi/12)
