3363
punti
Livello 2
sin(π/2+x) = -cos(x/3), cos(α) = sin(π/2-α) ---> -cos(x/3) = -sin(π/2-x/3)
sin(π/2+x) = -sin(π/2-x/3)
x-x/3 = -π/2-π/2 + 2kπ
2/3x = -π + 2kπ
x = 3/2*(-π + 2kπ) --> x = -3/2*π + 3kπ
x+x/3 = π + 2kπ
4/3x = π + 2kπ
x = 3/4*(π + 2kπ)
x = 3/4*π + 3/2*kπ
1713
punti
Livello 3