(x - 4)(x - 6) = (x + 2)( x + 8)
x² - 10x + 24 = x² + 10x + 16
x² - x² - 10x - 10x = 16 - 24
- 20x = - 8
20x = 8
x = 8/20
x = 2/5
(sina-cosa)²=sin²a-2sinacosa+cos²a=1-2sinacosa
2sinacosa=1-(sina-cosa)²
<span>sinacosa=[1-(sina-cosa)²]/2
</span>sinacosa=(1-0,36):2=0,64:2=0,32
0.66/1.2=0.55
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