Use the simple trigonometry calculator to calculate sum difference identities of trigonometric identities online.
Formula:
Sum Difference Identities Equations
sin(θ + φ) = [sin(θ) × cos(φ)] + [cos(θ) × sin(φ)]cos(θ + φ) = [cos(θ) × cos(φ)] - [sin(θ) × sin(φ)]
tan(θ + φ) = [tan(θ) + tan(φ)] / [(1 - tan(θ) × tan(φ))]
sin(θ - φ) = [sin(θ) × cos(φ)] - [cos(θ) × sin(φ)]
cos(θ - φ) = [cos(θ) × cos(φ)] + [sin(θ) × sin(φ)]
tan(θ - φ) = [tan(θ) - tan(φ)] / [(1 + tan(θ) × tan(φ))]