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Pythagorean Identity
Cos(θ)² + Sin(θ)² = 1
Cos(-θ)=
Cos(θ)
Sin(-θ)=
-Sin(θ)
Tan(-θ)=
-Tan(θ)
Cos(90-θ)=
Sin(θ)
Sin(90-θ)=
Cos(θ)
Cos(180-θ)=
-Cos(θ)
Sin(180-θ)=
Sin(θ)
Tan(180-θ)=
-Tan(θ)
Cos(180+θ)=
-Cos(θ)
Sin(180+θ)=
-Sin(θ)
Tan(180+θ)=
Tan(θ)