|cosx| = 1
Значит:
cosx= 1 -> x=2pi*k
cosx = -1 -> x=pi+2pi*N
|ctgx| = 1
ctgx = 1 -> x=pi/4 + 2pi*k
ctgx = -1 -> x=3pi/4 + 2pi*N
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|cosx| = 1
Значит:
cosx= 1 -> x=2pi*k
cosx = -1 -> x=pi+2pi*N
|ctgx| = 1
ctgx = 1 -> x=pi/4 + 2pi*k
ctgx = -1 -> x=3pi/4 + 2pi*N