求值sin(-23/6 π)+cos13/7 πtan4π-cos13/3π
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求值sin(-23/6 π)+cos13/7 πtan4π-cos13/3π
求值sin(-23/6 π)+cos13/7 πtan4π-cos13/3π
求值sin(-23/6 π)+cos13/7 πtan4π-cos13/3π
sin(-23/6 π)+cos13/7 πtan4π-cos13/3π
=sin(-23/6 π+4π)+0-cos(13/3π-4π)
=sinπ/6-cosπ/3
=1/2-1/2
=0
0
求值sin(-23/6 π)+cos13/7 πtan4π-cos13/3π
计算:sin(-23π/6)+cos13π/7*tan4π-cos13π/3
求值sin7π/3cos(-23π/6)+tan(-11π/4)cos13π/3
COS13/6π
三角代数式sin(-23/6∏)+cos13/7∏乘tan3∏-cos13/3∏的值为
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
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
sin(-4π/3)= cos(-79π/6)= cos13π/6=
sin(-11兀/6)+cos13兀/3×tan4兀
sin(-7π/6)求值
计算sin7π/3cos13π/6+sin(-11π/6)cos(-11π/3)
与cos13π/3的值相同的是 :A.nπ/3 B.sinπ/4 C.sinπ/6
sin13π/6+cos13π/3-tan(-23π/4)=
cos13兀/6
sin(-π/4)求值
计算:cos13π/4+tan(-11π/6)=?
计算:√3sin(-20/3∏)-cos13/4π×tan(-37/4π)
求值SIN17度COS13度加COS17度COS77度