Cosine cos = adjacent edge/hypotenuse

Tangent tan = opposite side/adjacent side =sin/cos

Cotangent cot = adjacent edge/opposite edge = 1/tan

sin 30= 1/2

sin 45=√2/2

sin 60=√3/2

cos 30=√3/2

cos 45=√2/2

cos 60=√3/2

tan 30=√3/3

tan 45= 1

tan 60= √3

Cost 30=√3

cot 45= 1

Cost 60= √3/3