2x-x=-10-4+12
x=-2
+2+4=-2(3)+12
6=12-6
= log₂₎₇₅ (4/11) = 1
2,75 = 2 3/4 = 11/4
А) 37/500; 0,7; 0,75
Б) 0,125; 0,13; 29/200
<span><span>(sin^t+2sintcost-cos^2t)^2=(sin2t-cos2t)^2=(sin2t)^2+(cos2t)^2-2sin2tcos2t=1-sin4t
1 - cos альфа + cos 2альфа / sin 2альфа - sin альфа=
=(1-cosa+2cos^2a-1)/(sina(2cosa-1)=cosa(2cosa-1)/sina(2cosa-1)=cosa/sina=ctga
</span>sin 5пи/18 cos пи/9 - sin пи/9 cos 5пи/18 / sin 5пи/12 sin 7пи/12 - cos 5пи/12 cos 7пи/12=
=sin(5pi/18-2pi/18)/-(cos(5pi/12+7pi/12)=sin(pi/6)/-cospi=1/2
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