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Identitas Trigonometri
| \(\sin^2\:\alpha + \cos^2\:\alpha=1\) | \(\tan\alpha = \dfrac{\sin\alpha}{\cos\alpha}\) |
| \(1 + \tan^2\:\alpha =\sec^2\:\alpha\) | \(\cot\alpha = \dfrac{\cos\alpha}{\sin\alpha}\) |
| \(1 + \cot^2\:\alpha =\csc^2\:\alpha\) |
Dengan menggunakan relasi sudut, fungsi-fungsi trigonometri dapat diubah seperti contoh di bawah ini:
\(\sin (90 - x) = \cos x\)
\(\cos (90 - x) = \sin x\)
\(\tan (90 - x) = \cot x\)
\(\cot (90 - x) = \tan x\)
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