With the values of sin and cos in hand, one can easily find the values for the rest of the trigonometric ratios. The aforementioned trick will help you derive the values of trigonometric ratios even if you somehow forget the trigonometric table. ...
° 间变化时正弦值随着角度的增大而增大,且 0≤sinα≤1余弦值随着角度的增大而减小,且 0≤cosα≤1正切值随着角度的增大而增大, tanα≥02)当角度在 90°∼180° 间变化时正弦值随着角度的增大而减小,且 0≤sinα≤1余弦值随着角度的增大而减小,且 -1≤cosα≤0正切值随着角度的增大而增大...