Sin^2 x + 2sin x + 1=0

Question

Sin^2 x + 2sin x + 1=0

Answer 1

Решение
Sin^2 x + 2sin x + 1=0
(sinx + 1)² = 0
sinx + 1 = 0
sinx = - 1
x =  - π/2 + 2πk, kЄZ