Question

近似计算cos61°的值 求详细的过程步骤

Answer 1

你好

cos61°
=cos（60°+1°）
=cos60°*cos1°-sin60°*sin1°
cos60°=1/2=0.5
cos1°~1
sin60°=√3/2=0.866
sin1°~1°/180°π=0.0174
cos61°≈0.5*1-0.866*0.0174
≈0.485

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追问

考试就直接这么些么

追答

就这样写，相信我吧~

Answer 2

cos61°的值

=cos（60°+1°）
=cos60°cos1° - sin60°sin1°

=0.5*cos1° -0.866*sin1°
=0.5*0.9998 -0.866*0.0175
=0.4999-0.0152
=0.4847