π/6 sinα=1/2, cosα=√3/2, tαnα=√3/3 cotα=√3
π/4 sinα=√2/2, cosα=√2/2, tαnα=1 cotα=1
π/3 sinα=√3/2, cosα=1/2, tαnα=√3 cotα=√3/3
π/2 sinα=1, cosα=0, tαnα不存在,cotα=0
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