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10 questions from this quiz
sin(θ + φ) = sin θ cos φ + cos θ sin φ
cos θ cos φ + sin θ sin φ
tan(θ + φ) = sin(θ + φ)/cos(θ + 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)
sin(45° + 30°)
sin(50°)
To simplify trigonometric functions
Unit circle diagrams
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