COS13/6π
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COS13/6πCOS13/6πCOS13/6πCOS13/6π=cos(π/6)=根号3/2
COS13/6π
COS13/6π
COS13/6π
COS13/6π=cos(π/6)=根号3/2
COS13/6π
求值sin(-23/6 π)+cos13/7 πtan4π-cos13/3π
计算:sin(-23π/6)+cos13π/7*tan4π-cos13π/3
cos13兀/6
计算:cos13π/4+tan(-11π/6)=?
求值sin7π/3cos(-23π/6)+tan(-11π/4)cos13π/3
sin(-4π/3)= cos(-79π/6)= cos13π/6=
sin13π/6+cos13π/3-tan(-23π/4)=
用诱导公式求cos13π/6的余弦函数值,带过程
1.化简:(sin450°-α)-sin(180°-α)+cos(450°-α)+cos(180°-α)的值2.化简:sin(-23/6π)+cos13π/7xtan4π-cos13/3π
计算sin7π/3cos13π/6+sin(-11π/6)cos(-11π/3)
sin(-11兀/6)+cos13兀/3×tan4兀
三角代数式sin(-23/6∏)+cos13/7∏乘tan3∏-cos13/3∏的值为
与cos13π/3的值相同的是 :A.nπ/3 B.sinπ/4 C.sinπ/6
计算:√3sin(-20/3∏)-cos13/4π×tan(-37/4π)
sin43°cos13°
计算不太明白...求值sin(-1320°)*cos1110°+cos(-1020°)sin750°+tan(-405°)求值sin25π/6+cos25π/3+tan25π/4+sin7π/3*cos13π/6-cos5π/3
函数y=cos(x-π/8)(x∈[π/6,2π/3])的最小值是 答案为1/2,求详解.答案是1/2,回答cos13π/24的都歇歇吧.木马.求正解