(1-tg^2 * pi/8)/(1+tg^2 * pi/8)=?

1)c3h6+hoh(н+) =c3h7oh-получение

2c3h7oh+2na=2c3h7ona+h2

ch3-ch2-ch2oh+cuo(t) =ch3-ch2-coh+cu+h2o

2)сh3-ch2-ch2-ch2oh + cuo(t) =ch3-ch2-ch2-coh +cu+h2o-получение

ch3-ch2-ch2-coh+h2=ch3-ch2-ch2-ch2oh

  ch3-ch2-ch2-coh+ag2o(t) = ch3-ch2-ch2-cooh+2ag

3)2ch3-(ch2)3-cooh+2na=2ch3-(ch2)3-coona+h2

2ch3-(ch2)3-cooh+mgo=(ch3-ch2-ch2-ch2-coo)2mg+h2o

ch3-(ch2)3-cooh+naoh=ch3-(ch2)3-coona+h2o

2ch3-(ch2)3-cooh+na2co3=2ch3-(ch2)3-coona+co2+h2o

4)c2h5oh+ch3-cooh= c2h5-o-co-ch3+h2o

    c5h11oh+h-cooh= c5h11-o-co-h +h2o

    c7h13oh+c2h5-cooh= c7h13-o-co-c2h5+h2o

      c5h11oh+ c5h11-cooh=c5h11-o-co-c5h11+ h2o

1) sin a = √2/2; a1 = pi/4+2pi*k; cos a1 = √2/2
a2 = 3pi/4+2pi*k; cos a2 = -√2/2
cos(60 + a1) = cos 60*cos a1 - sin 60*sin a1 =
= 1/2*√2/2 - √3/2*√2/2 = √2/4*(1 - √3) = -√2(√3 - 1)/4
cos(60 + a2) = cos 60*cos a2 - sin 60*sin a2 =
= -1/2*√2/2 - √3/2*√2/2 = -√2/4*(1 + √3) = -√2(√3 + 1)/4

2) sin a = 2/3; cos b = -3/4; a ∈ (pi/2; pi); b ∈ (pi; 3pi/2)
cos a < 0; sin^2 a = 4/9; cos^2 a = 1-4/9 = 5/9; cos a = -√5/3
sin b < 0; cos^2 b = 9/16; sin^2 b = 1-9/16 = 7/16; sin b = -√7/4
sin(a+b) = sin a*cos b + cos a*sin b =
= 2/3*(-3/4) + (-√5/3)(-√7/4) = -6/12 + √35/12 = (√35 - 6)/12
cos(-b) = cos b = -3/4