Double Angle Calculator sin(2θ), cos(2θ), tan(2θ). Angle (degrees) sin(2θ) 0.866 cos(2θ) 0.5 tan(2θ) 1.732 Step-by-step with your numbers: 1. Values used: 2. Angle = 30 degrees 3. sin(2θ) = 0.866 4. cos(2θ) = 0.5 5. tan(2θ) = 1.732 Did we solve your problem today? 👍 Yes 👎 No Thanks for the feedback! sin(2θ), cos(2θ), tan(2θ). FAQ Formulas? sin(2θ)=2sinθcosθ; cos(2θ)=cos²θ−sin²θ. Related calculators Half Angle Calculator sin(θ/2), cos(θ/2), tan(θ/2). Trigonometry Calculator Find sine, cosine and tangent of an angle.