Помогите, срочно, очень прошу!!!!(((((

Question

Помогите, срочно, очень прошу!!!!(((((

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Answer 1

1)   5π/6+π/4 =13π/12;  π/3 + π/2 =5π/6;  1 +π/6 = 1 +π/6; 
coosπ/6 = 1/2;  
2)  = (1/3 *x - π/3) =πn, n∈Z; 1/3*x =πn +π/3;  x = 3πn +π; n∈Z;

=2x =2π/3 +2πn,n∈Z;  x = π/3 +πn,n∈Z;

2cosx -1 =0; 2cosx = 1; cosx =1/2; x =+- π/3+2πn,n∈Z; 
 sinx = √2/2;  x = [tex] (-1)^{n} \pi /4 + \pi n, n∈Z;