4(sinα+cosα)^2-4sin2α=4(sin^2α+2sinαcosα+cos^2α)-8sinαcosα=4(2sinαcosα+1)-8sinαcosα=8sinαcosα+1-8sinαcos<span>α</span>=1
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5х3-125=0
Х(5х2-125)=0
х=0 5х2=125
х2=25
х=корнеь 25
х=5
log_3 67,5 - log_3 2,5 = log_3 67,5/2,5 = log_3 27 = 3