(a^2 - 36)(a^2 + 36) - (a^4 - 36a^2 + 324) =
= a^4 - 1296 - a^4 + 36a^2 - 324 =
= 36a^2 - 1620 =
= 36(a^2 - 45)
36* (1/36 - 45) = 1 - 45*36 = - 1619
Z*6=64
Z=64/6
Z=32/3
Z=10 2/3.
1)1 11/24+13/36=1 33/72+26/72=1 59/72
2)1 59/72*1 44/100=131/72*144/100=262/100=2,62
3)8/15*5625/10000=8*375/10000=3000/10000=0,3
4)2,62-0,3=2,32
Sin(x-8п)=sinx
cos(16п-x)=cosx
sin^2x+cos^2x=1
sin^2 x=1-cos^2 x