Y=x² y=2x-x²
x²=2x-x² 2x²-2x=0 x(x-1)=0
x1=0 y1=0
x2=1 y2=1
3 + 2√6 + 2 - √24 = 5 + 2√6 - 2√6 = 5
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<span>ctg a = 8/15 и 0 < a < П/2
tga = 1/ctga = 15/8
tg</span>²a + 1 = 1/cos²a
cos²a = 1/(tg²a + 1)
cos²a = 1/((15/8)² + 1)
<span>cos²a = 1/((225/64) + 1)
</span>cos²a = 64/289
cosa = 8/17
tga = sina/cosa
<span>sina = cosa*tga = 8/17 * 15/8 = 15/17</span>