есть 3 варианта решения, подскажите, какое правильнее:

1:
sinxcosx=0 | :cos^2x
tgx=0
x= πn, n€Z

2:
sinxcosx=0 | *2
2sinxcosx=0
sin2x=0
2x=πn
x= πn/2, n€Z

3:
sinxcos=0
sinx=0 cosx=0
x=πn x=π/2 + πn




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