Cosine Calculator cos of an angle. Angle (°) cos 0.5 Step-by-step with your numbers: 1. Values used: 2. Angle = 60 ° 3. cos = 0.5 Did we solve your problem today? 👍 Yes 👎 No Thanks for the feedback! Cosine function. FAQ cos60°? 0.5. Related calculators Sine Calculator sin of an angle. Tangent Calculator tan of an angle. Trigonometry Calculator Find sine, cosine and tangent of an angle.