37^2-2*37*117+117^2 = (117-37)^2= 80^2 = 6400
<span>1-cos2x=2sinx</span>
<span>1-(cos^2x-sin^2x)=2sinx</span>
sin^2x+cos^2x-cos^2x+sin^2x-2sinx=0
2sin^2x-2sinx=0
2sinx(2sinx-1)=0
<u>2sinx=0</u>
2sinx=Пn
sinx=Пn/2
<u>2sinx-1=0</u>
2sinx=1
sinx=1/2
x=(-1)^n*arcsin(1/2)+Пn
x=(-1)^n*П/6+Пn
Sin²x=3sinxcosx
sin²x-3sinxcosx=0
sinx(sinx-3cosx)=0
sinx=0
x=πk, k € Z
sinx-3cosx=0|:coax
tgx-3=0
x=arctg(3)+πn, n € Z
(4у³+15у)-(17у-у³)=4у³+15у-17у+у³=5у³-2у=у(5у²-2)