Cos100/cos50+sin50 -(cos^2 25-sin^2 25)​

объяснение:

[tex]\frac{cos100}{cos50} +sin50-(cos^{2}25 - sin^{2}25 ) =\frac{cos100}{cos50}+sin50-cos50 =\frac{cos^250-sin^250-cos^250}{cos50}+sin50=sin50-tg50sin50=sin50(1-tg50)[/tex]

ответ:

[tex]sin50(1-tg50)[/tex]

x1^2+x2^2=36

(x1+x2)-2x1x2=36

теорема виета: x1+x2=6

36-2x1x2=36

x1x2=0

x1x2=c/a=p=> p=0