Question

Cos (60+x)=0 pada interval 0,360 adalah

Answer 1

cos(θ) = 0.360
θ = 60°, 300° - on interval 0 ≤ θ ≤ 360
θ = 360°k + 60°, 360°k - 60°, for all integers k - on interval (-∞, ∞)

Use same method, but with x + 60° in place of θ

cos(x + 60°) = 0.360

x + 60° = 60°, 300°, 420°
x = 0°, 240°, 360° - on interval 0 ≤ x ≤ 360

x + 60° = 360k + 60, 360k - 60, for all integers k
x + 60° = 360k, 360k - 120, for all integers k - on interval (-∞, ∞)