Question

3 sin ^2 2x + 10sin 2x + 3 = 0
Что-то там с дискриминант

Answer 1

3sin^2 2x + 10sin2x + 3 = 0

1) sin 2x =t

2) 3t^2 + 10 t + 3 =0

D= 10^2 - 4×3×3 =100-36=64=8^2

t1= -10-8/6=-18/6=-2

t2= -10+8/6=-2/6=-1/3

3) sin2x = -2

sin2x = - 1/3