Cos^2 x - cos^2 x + sin^2 x= 3/4
sin^2 x = 3/4
sin x= +- √3/2x= p/3 +2pm, m ∈ Z.
p/3 - 6p/3 = - 5p/3
x= 2p/3 + 2pl, l ∈ Z.
2p/3 - 6p/3 = - 4p/3
x= -p/3 + 2pk, k ∈ Z.НЕТ РЕШЕНИЙx= -2p/3 + 2pn, n ∈ Zl= 0-2p/3
Ответ: а) p/3 +2pm, m ∈ Z.2p/3 +2pm, m ∈ Z.-p/3 +2pm, m ∈ Z.-2p/3 +2pm, m ∈ Z.б) -2p/3; -4p/3 ; -5p/3;