Question

Чему равен |cosx| = 1 и |ctgx| = 1

Answer 1

|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