(1+tan21°)(1+tan22°)(1+tan23°)(1+tan24°)的值是 ______.
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(1+tan21°)(1+tan22°)(1+tan23°)(1+tan24°)的值是 ______.
根据tan45°=tan(21°+24°)=
tan21°+tan24°
1−tan21°tan24°=1
得到tan21°+tan24°=1-tan21°tan24°①;同理得到tan22°+tan23°=1-tan22°tan23°②;
则原式=[(1+tan21°)(1+tan24°)][(1+tan22°)(1+tan23°)]
=(1+tan24°+tan21°+tan24°tan21°)(1+tan22°+tan23°+tan22°tan23°)
=(1+1-tan24°tan21°+tan24°tan21°)(1+1-tan22°tan23°+tan22°tan23°)=4
故答案为:4.
tan21°+tan24°
1−tan21°tan24°=1
得到tan21°+tan24°=1-tan21°tan24°①;同理得到tan22°+tan23°=1-tan22°tan23°②;
则原式=[(1+tan21°)(1+tan24°)][(1+tan22°)(1+tan23°)]
=(1+tan24°+tan21°+tan24°tan21°)(1+tan22°+tan23°+tan22°tan23°)
=(1+1-tan24°tan21°+tan24°tan21°)(1+1-tan22°tan23°+tan22°tan23°)=4
故答案为:4.
(1+tan21°)(1+tan22°)(1+tan23°)(1+tan24°)的值是 ______.
tan21°+tan24°+tan21°tan24°的值怎么算啊?
化简:tan21度(1+tan24度)+tan24度
tan21°+tan39°分之1-tan21°tan39°
tan22.5°÷(1-tan²22.5)
用计算器计算下列各式的值 (1)tan23° (2)tan86.5°
tan22.5°1-tan222.5°= ___ .
化简:(1)tan53°-cot67°/1+tan53°tan23°(2)1+cot75°/1-tan15°
化简(tan53°-cot67°)/(1+tan53°tan23°)
tan21°+tan39°-根号tan21°*tan39°的值为?
(1+tan21度)*(1+20度)*(1+23度)*(1+24度)的值?)
(1+tan183°)(1+tan42°)=?A:√3 B:1+√2 C:2 D:2(tan23°+tan37°)