Ответ:
Объяснение:
1,4x² + (x - 1,2)(x + 1,2)= 0
1,4x²+(x²-1,44)=0
1,4x²+x²-1,44=0
2,4x²-1,44=0 // : 2,4
x²-0,6=0
x²=0,6
x=±√0,6
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
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