Ответ:
sinx+cosx=1.4
(sinx+cosx)^2=1.4^2
sin^2x+cos^2x+2sinxcosx=1.96
1+2sinxcosx=1.96
2sinxcosx=0.96
sin2x=0.96
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Ответ:
sinx+cosx=1.4
(sinx+cosx)^2=1.4^2
sin^2x+cos^2x+2sinxcosx=1.96
1+2sinxcosx=1.96
2sinxcosx=0.96
sin2x=0.96