Trig Functions Table & Identities Cheat Sheet

Exact values for sine, cosine, and tangent at common special angles in radians and degrees:

• 0° (0 rad): Sin = 0 | Cos = 1 | Tan = 0
• 30° (π/6): Sin = ½ | Cos = √3/2 | Tan = 1/√3
• 45° (π/4): Sin = √2/2 | Cos = √2/2 | Tan = 1
• 60° (π/3): Sin = √3/2 | Cos = ½ | Tan = √3
• 90° (π/2): Sin = 1 | Cos = 0 | Tan = Undefined

• sin²(θ) + cos²(θ) = 1
• 1 + tan²(θ) = sec²(θ)
• 1 + cot²(θ) = csc²(θ)