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10 cards from this deck
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)
Use unit circle and cosine rule for derivation.
sin(75°) = sin(45°)cos(30°) + cos(45°)sin(30°)
They simplify calculations in trigonometry problems.
It equals sin(50°) using the sine sum identity.
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