Question

Решите Уравнение: cos4x=0

Answer 1

cos4x = 0

4x = π/2 + 2πn

x = π/8+πn/2  , n ∈ Z

Answer 2

$cos4x=0\ 4x = frac{pi}{2} + pi k, k = z\ x = frac{pi}{8} + frac{pi k }{4}, k = z$