<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
</span>
Y`=e^x+sinx+e^x*cosx=e^x*(sinx+cosx)
y`=e^x*sin²7x+7e^x*2sin7xcos7x=e^x*sin²7x+7e^x*sin14x
√27a³=3a√3a.....................................
X1=4
x2=-4-4=-8
x3=8-4=4
x4=-4-4=-8
x5=8-4=4
x6=-4-4=-8
5x²-5x²-20x+x+4=-19x+4=-19*0,1+4=-1,9+4=2,1