Sin 2x = 2 sin x cos x
sin (pi -x) = sin x
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cos(pi/33)*cos(2pi/33)*cos(4pi/33)*cos(8pi/33)*cos(16pi/33) = sin(pi/33)*cos(pi/33)*cos(2pi/33)*cos(4pi/33)*cos(8pi/33)*cos(16pi/33) / sin(pi/33) = sin(2pi/33)*cos(2pi/33)*cos(4pi/33)*cos(8pi/33)*cos(16pi/33) / 2sin(pi/33) = sin(4pi/33)*cos(4pi/33)*cos(8pi/33)*cos(16pi/33) / 4sin(pi/33) = sin(8pi/33)*cos(8pi/33)*cos(16pi/33)/ 8sin(pi/33) = sin(16pi/33)*cos(16pi/33)/ 16sin(pi/33) = sin(32pi/33) / 32pi(33) = sin(pi-pi/33)/16sin(pi/33) = sin(pi/33) / 32sin(pi/33) = 1/32
Y^2+2y-4y-8-(y^2-4y+4)=y^2+2y-4y-8-y^2+4y-4=2y-4=2(y-2)
[(x+1)^2-x^2]=x^2+2x+1-x^2=2x+1=x+(x+1)
Ответ:
Объяснение:
a)4√49-3√25=4√7²-3√5²=4*7-3*5=27-15=13
b)0,2√4900=0,2√70²=0,2*70=14
c)3√(64/81)=3√[(8²)/9²)]=3*8/9=2 2/3
d)√3,61-10√2,89=√(1,9)²-10√(1,7)²=1,9-10*1,7=1,9-17=-15,1