sin30°=()
√2/2
-1/2
√3/2
1/2
sin150°=()
√3/2
0
-1/2
1/2
cos120°=()
√3/2
-√3/2
1/2
-1/2
sin90°=()
1
-1
0
1/2
cos180°=()
-1
1/2
1
0
tan60°=()
1
0
√3
√3/3
cos60°=()
-1/2
√2/2
0
1/2
sin135°=()
-√2/2
√2/2
1/2
√3/2
锐角α满足sinα=√3/2,则α=()
30°
120°
150°
60°
已知0°<α<180°,cosα=-1/2,α为()
60°
120°
90°
30°
cos45°=()
1/2
√2/2
√3/2
1
sin120°=()
1/√2
-1/2
√3/2
1/2