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misal < A = 45'
(Sin45')² + (Cos45')² = (1/2√2)² + (1/2√2)²
= 1/2 + 1/2
= 1
Misal < A = 30'
(sin 30')² + (cos 30')² = (1/2)² + (1/2 √3)²
= 1/4 + 3/4
= 1
Jadi berlaku untuk berapapun nilai dari < A
Ditemukan dari theorema phytagoras
a (adjacent) = samping
o (opposite) = depan
h (hypotenuse) = sisi miring
Agar diperoleh perbandingan, kita bagi dengan suatu sisi, misal h
⇔
⇔
Dari situ di dapatkanlah
NB:
= cos
= sin