Answer:
cosθ = 0.87
Explanation:
Identity given,
sin²θ + cos²θ = 1
Values of sinθ = 0.5
Since, angle θ is in the first quadrant, all values of cosθ and sinθ will be positive.
Therefore, cos²θ = 1 - sin²θ
cos²θ = 1 - (0.5)²
cos²θ = 1 - 0.25
cosθ = √(0.75)
= 0.86603
≈ 0.87
Therefore, value of cosθ will be 0.87