Y= sin^2x + 4sinx + 4

Sin^2x - 4sinx = 5 
<span>sin^2x - 4sinx - 5 = 0 </span>
<span>(sinx - 5 )*( sinx +1 ) = 0 </span>

1) sinx = 5 ==> нет решений
2) sinx = - 1 ==> x = - pi/2 + 2pik, k ∈ Z

ОТВЕТ:
<span>x = - pi/2 + 2pik, k ∈ Z</span>