The angle θ 1 θ 1 ​ theta, start subscript, 1, end subscript is located in Quadrant I Istart text, I, end text, and sin ⁡ ( θ 1 ) = 1 2 sin(θ 1 ​ )= 2 1 ​ sine, left parenthesis, theta, start subscript, 1, end subscript, right parenthesis, equals, start fraction, 1, divided by, 2, end fraction . What is the value of cos ⁡ ( θ 1 ) cos(θ 1 ​ )cosine, left parenthesis, theta, start subscript, 1, end subscript, right parenthesis? Express your answer exactly. cos ⁡ ( θ 1 ) =