Deartdu.com 做一做 Sin45 √2 B 2 cos45° 45 2 A tan45° cot45°=1
A B C 45° 1 1 Sin45 ° = cos45° = tan45° = cot45° = 2 2 2 2 1 1 做一做 2
Deartdu.com 做一做 B sin60°=√3 2 cos60°= 60 A tan60°= √3 cot60°= 3
A C B 60° 1 2 sin60° = cos60° = tan60° = cot60° = 3 3 2 2 1 3 3 3 做一做