<u>m-8 </u> .<u>15m^2 </u><u> </u>=<u>15m^2 </u><u>
</u> 8m (m-8)(m+8) 8m^2+64m<u /><u />
Х²+2х-48=0
х²+6х-8х-48=0
(х²+6х)+(-8х-48)=0
х(х+6)-8(х+6)=0
(х+6)(х-8)=0
1)х+6=0 2)х-8=0
х=-6 х=8
(корень)6,25-5,76=(корень)0,49=0.7
<span>sinxsiny=1/a cosxcosy=</span><span>1/b
сos(x-y)-cos(x+y)= </span><span>2/a
</span>сos(x-y)+cos(x+y)=2/b
2сos(x-y)=2/a+2/b cos(x-y)=(a+b )/ab x-y=+- arccos[(a+b )/ab]+2πk
2cos(x+y)=2/b-2/a cos(x+y)=(a-b )/ab x+y= +-arccos[(a-b )/ab]+2πm
x=+-0.5arccos[(a+b )/ab]+-0.5arccos[(a-b )/ab]+π(k+m)
y=+-0.5arccos[(a-b )/ab]+-0.5arccos[(a+b )/ab]+π(m-k) m,k∈Z