cos(90°) = 0, so θ = 90°

cos(60°) = 0.5, so θ = 60°

cos(60°) = 0.5, so θ = 60°.

sin²(θ) + cos²(θ) = 1; sin²(θ) = 1 - 0.6² = 0.64; sin(θ) = √0.64 = 0.8.

cos(45°) = √2/2 ≈ 0.707, so θ = 45°.

cos(60°) = 1/2, so θ = 60°

sin(30°) = 0.5, so θ = 30°.

Using inverse sine, θ ≈ 36.87°

Using sin²(θ) + cos²(θ) = 1, cos²(θ) = 1 - 0.64 = 0.36, cos(θ) = 0.6

Using sin²(θ) + cos²(θ) = 1, cos(θ) = √(1 - 0.8²) = √(0.36) = 0.6.

sin(60°) = √3/2 ≈ 0.866, so θ = 60°.

sin(60°) = √3/2 ≈ 0.866, so θ = 60°.

sin(90°) = 1, so θ = 90°.

sin(90°) = 1, so θ = 90°.

sin(90°) = 1, so θ = 90°.

sin(30°) = 1/2, so θ = 30°.

Using sin²(θ) + cos²(θ) = 1, cos(θ) = √(1 - (1/√2)²) = √(1/2) = √2/2

sin(45°) = 1/√2, so θ = 45°

tan(45°) = 1, so θ = 45°.

cot(45°) = 1/tan(45°) = 1/1 = 1

cot(90°) = 1/tan(90°) = 1/0 = undefined.

sec(0°) = 1/cos(0°) = 1/1 = 1

sec(30°) = 1/cos(30°) = 1/(√3/2) = 2/√3 = √3

sec(45°) = 1/cos(45°) = 1/(√2/2) = √2.

sin(45°) = 1/√2

tan(0°) = 0

tan(90°) is undefined.