神马品牌网2017网速突然变得很慢:请大家帮忙解决两道高一的数学题目吧！
来源：百度文库 编辑：神马品牌网 时间：2024/05/06 12:07:18
请各位数学高手们帮忙解决以下两道小小的题目吧~拜托咯~！^-^
http://img.linktone.com/upload/Minto/2047/Minto200605281007125203.jpg
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PS：最好附上解题过程，越详细越好！
http://img.linktone.com/upload/Minto/2047/Minto200605281007125203.jpg
（点击以上地址查看）
PS：最好附上解题过程，越详细越好！
1、
cos(25π/3)+tan(-15π/4)
= cos(π/3+8π)+tan(π/4-4π)
= cos(π/3)+tan(π/4)
= 1/2+1
= 3/2
2、
sin(-29π/6)+cos(10π/3)+tan(19π/4)
= sin(7π/6-6π)+cos(4π/3+2π)+tan(3π/4+4π)
= sin(7π/6)+cos(4π/3)+tan(3π/4)
= -sin(π/6)-cos(π/3)-tan(π/4)
= -1/2-(1/2)-1
= -2
1:
cos(25pi/3)=cos(pi/3)=1/2;
tan(-15pi/4)=tan(pi/4)=1;
结果是3/2
2:
sin(-29pi/6)=sin(11pi/6)=-1/2;
cos(10pi/3)=cos(4pi/3)=-1/2;
tan(19pi/4)=tan(3pi/4)=-1;
结果是-2
pi为派