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Fundamental formula of trigonometry
The fundamental formula of trigonometry is just the Pythagorean theorem
cos2θ + sin2θ = 1
Explanation
We start from the unit circle.
From the Pythagorean theorem follows
cos2θ + sin2θ = 1
< 1 >
The fundamental formula of trigonometry is just the Pythagorean theorem
cos2θ + sin2θ = 1
We start from the unit circle.
From the Pythagorean theorem follows
cos2θ + sin2θ = 1