(1/2)^(x-6) = 32^x
2^(6 - x) = 2^(5x)
2^6 / 2^x = 2^(5x)
2^6 = 2^(6x)
x = 1
3 дес 7 ед= 37 ед.
37 ед. < 39 ед.
для книги в 50 страниц надо 10 цифр
2sin²t+2cos²t=2(
sin²t+cos²t)=2·1=2
3-sin²t-cos²t =3- (sin²t+cos²t)=3-1=2
2/2-1/sin²t= 1-1/sin²t=1-(1+ctg²t)=
1-1-ctg²t =-ctg²t
2.sint=-√(1-cos²t), sint=-√(1-81/1681)=-√1600/1681=-40/41
tgt=sint/cost=-40/41:9/41=
-40/41·(41/9)=-40/9
ctgt=1/tgt=-9/40