Question

Помогите, срочно нужно :))) 

cos(3x-4/pi)=1/2

Answer 1

cos(3x - pi/4) =1/2

 

3x - pi/4 = pi/3 + 2pik

3x - pi/4 = - pi/3 + 2pik

 

3x = (pi/3 + pi/4) + 2pik

3x = (-pi/3 + pi/4) + 2pik

 

3x = 7pi/12 + 2pik

3x = - pi/12 +2pik

 

x = 7pi/36 + 2pik/3, k∈Z

x = - pi/36 +2pik/3, k∈Z