一d三角幾何ge問題

2008-03-03 2:56 am
sin=?
cos=?
tan=?
仲有另外3個又=乜?

同埋sin0=?,sin30=?,sin45=?,sin60=?,sin90=?
cos..................................................=?
tan..................................................=?

不循環果d小數同根號表示...

thxthx

回答 (2)

2008-03-03 4:28 am
✔ 最佳答案
sin=0.01745240644373
cos=0.999847695157
tan=0.0174550649282

sin0=0,sin30=0.5,sin45=0.707106781187,sin60=0.8660254003785,sin90=1
cos0=1,cos30=0.8660254003785,cos45=0.707106781187,cos60=0.5,cos90=0
tan0=0,tan30=0.577350269189,tan45=1,tan60=1.73205080757,tan90=天文數字
= =
2008-03-03 8:35 am
Sin=Sine=Opposite side/Hypotenus(對邊/斜邊)(長度)
Cos=Cosine=Adjacent side/Hypotenus(邊/斜邊)(長度)
Tan=Tangent=Opposite side/Adjacent side(對邊/斜邊)(長度)
They are called trigo ratios(三角函數).
sin0=0 cos0=1
sin30= 0.5 cos30=√0.75(√3/2)
sin45=√0.5(√2/2) cos45=√0.5(√2/2)
sin60=√0.75(√3/2) cos60=0.5
sin90=1 cos90=0

tan0=0
tan30=1/√3
tan45=1
tan60=√3
tan90=無限(1/0)
參考: Myself and my calculator


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