化简sin15°-cos15°/sin15°+cos15°
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化简sin15°-cos15°/sin15°+cos15°
化简sin15°-cos15°/sin15°+cos15°
化简sin15°-cos15°/sin15°+cos15°
sin15°-cos15°/sin15°+cos15°
=tan15°-1 / tan15°+1
=tan15°-tan45° / tan15°+1
=tan(15°-45°)
=-tan30°
=-√3/3
=(1/2)*2sin15°*cos15°
=(1/2)*sin(15°+15°)
=(1/2)*sin30°
=(1/2)*(1/2)
=1/4
把sin15看做sin(45-30),把cos15看做cos(45-30),再根据和差公式计算就可以了
化简sin15°-cos15°/sin15°+cos15°
化简sin15°-cos15°/sin15°+cos15°
化简:sin15°*cos15°
化简(sin15 °+cos15°)2
化简﹙cos15°-sin15°﹚÷﹙cos15°+sin15°﹚
(sin15°-cos15°)/(sin15°+cos15°)=
sin15°-cos15°/sin15°+cos15°的值?
sin15°-cos15°/sin15°+cos15°的值?
sin15°cos15°等于
sin15°+cos15°过程
sin15°cos15°等于?
cos15°-sin15°=?
sin15°cos15°=
sin15°cos15°是什么意思
sin15°+cos15°=
化简sin15°-√3cos15°(过程)
求cos15°-tan15°/cos15°+sin15°
sin15°=?cos15°=?