这几道高一数学怎么做?请高手写出详细解题过程 一、计算 1、10cos270°+4sin0°+9tan0°+15cos360° 2、sin^2π/3+cos^43π/2-tan^2π/3 二、化简 1、-p^2cos180°+q^2sin90°-2pqcos0° 2、mtan0+ncos1/2π-psinπ-qcos3/2π-rsin2π
2019-04-02
这几道高一数学怎么做?
请高手写出详细解题过程 一、计算 1、10cos270°+4sin0°+9tan0°+15cos360° 2、sin^2π/3+cos^43π/2-tan^2π/3 二、化简 1、-p^2cos180°+q^2sin90°-2pqcos0° 2、mtan0+ncos1/2π-psinπ-qcos3/2π-rsin2π
优质解答
一、计算 1、10cos270°+4sin0°+9tan0°+15cos360° =10cos(360-90)+0+0+15 =10cos90 =0 2、sin2π/3+cos^43π/2-tan2π/3 =sin(π-π/3)+cos^4(π+π/2)-tan(π-π/3) =sin﹙π/3)+cos^4(π/2)-tan(π/3﹚ =﹙√3/2)+0-(√3) =3/4-3 =-9/4 二、化简 1、-p^2cos180°+q^2sin90°-2pqcos0° =p+q-2pq =(p-q) 2、mtan0+ncos1/2π-psinπ-qcos3/2π-rsin2π =0+ncos1/2π-0-qcos3/2π-0 =ncos1/2π-qcos3/2π 这道题是不是写错了,请核对?
一、计算 1、10cos270°+4sin0°+9tan0°+15cos360° =10cos(360-90)+0+0+15 =10cos90 =0 2、sin2π/3+cos^43π/2-tan2π/3 =sin(π-π/3)+cos^4(π+π/2)-tan(π-π/3) =sin﹙π/3)+cos^4(π/2)-tan(π/3﹚ =﹙√3/2)+0-(√3) =3/4-3 =-9/4 二、化简 1、-p^2cos180°+q^2sin90°-2pqcos0° =p+q-2pq =(p-q) 2、mtan0+ncos1/2π-psinπ-qcos3/2π-rsin2π =0+ncos1/2π-0-qcos3/2π-0 =ncos1/2π-qcos3/2π 这道题是不是写错了,请核对?