cosx²=1
cosx=1 cosx=-1
x=π+2πk,k∈z x=2kπ,k∈z
x=kπ,k∈z
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cosx²=1
cosx=1 cosx=-1
x=π+2πk,k∈z x=2kπ,k∈z
x=kπ,k∈z