2sinxcosx=3sinxcos²x
sinx=0 x=πn
cosx=0 x=π/2+πn
3cosx=2 cosx=2/3 x=+-arccos2/3+2πn всюду n∈Z
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sin4x=sin2x 2sin2xcos2x=sin2x
sin2x=0 2x=πn x=πn/2 n∈Z
2cos2x=1 cos2x=1/2 2x=+-π/3+2πn x=+-π/6+πn n∈Z
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cos2x+cos²x=0 2cos²x-1+cos²x=0
3cos²x=1 cosx=+-√3/3 x=+-arccos(√3/3)+2πn n∈Z
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2sinxcosx=cos²x
cosx=0 x=π/2+πn n∈Z
2sinx=cosx 2tgx=1 tgx=1/2 x=arctg(1/2)+πn n∈Z