Question

2 cos x + sin 2x =0


Побыстрее пожл

Answer 1

2cosx + 2sinx cosx = 0 
2cosx (1 + sinx) = 0  /:2
cosx (1 + sinx) = 0 

1)  cosx =  0
x = pi/2 + pik, k ∈Z

2) sinx = -  1
x = - pi/2 + 2pik, k ∈ Z