Срочно! 2cos^2x-4cosxsinx=0

Question

Срочно!
2cos^2x-4cosxsinx=0

Answer 1

3сosx(cosx-2sinx)=0
cosx=0⇒x=π/2+πn,n∈z
cosx-2sinx=0/cosx
1-2tgx=0
tgx=1/2⇒x=arctg1/2+πk,k∈z

Answer 2

3сosx(cosx-2sinx)=0
cosx=0⇒x=π/2+πn,n∈z
cosx-2sinx=0/cosx
1-2tgx=0
tgx=1/2⇒x=arctg1/2+πk,k∈z

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