37sin+cos+tan

张非致588sin37°+sin56° 与 cos35°+cos56°比大小 过程 -
鄂例牵18358965405 ______ 因为0---90°,余弦减函数所以cos53°>cos56°,cos34° >cos35°sin37°+sin56° -( cos35°+cos56°)=cos53°+cos34° -( cos35°+cos56°)=(cos53°-cos54°) +( cos34°-cos35°)>0所以:(sin37°+sin56° )>( cos35°+cos56°)

张非致588利用两角和(差)大的余弦公式化简cos58°cos37°+sin58°sin37°cos(60°+) - cos(60° - θ)cos(60°+θ)+cos(60° - θ) -
鄂例牵18358965405 ______[答案] cos58°cos37°+sin58°sin37° =cos(58-37)=cos22 cos(60°+θ)-cos(60°-θ) =-2sin60sinθ=-3^0.5sinθ cos(60°+θ)+cos(60°-θ) =2cos60cosθ=cosθ

张非致588sin37+cos30+tg60=?
鄂例牵18358965405 ______ 1.8

张非致588(sin37°+cos75°sin38°)/(cos37° - sin75°sin38°)=? -
鄂例牵18358965405 ______ 解答: (sin37°+cos75°sin38°)/(cos37°-sin75°sin38°)=[sin(75°-38°)+cos75°sin38°]/[cos(75°-38°)-sin75°sin38°]=(sin75°cos38°-cos75°sin38°+cos75°sin38°)/(cos75°cos38°+sin75°sin38°-sin75°sin38°)=sin75°cos38°/(cos75°cos38°)=...

张非致588数学高手来帮忙算算三角函数 -
鄂例牵18358965405 ______ 1.sin37cos7-cos37sin7 = sin(37 - 7) = sin 30 = 1/22.cos37cos23-sin37sin23 =cos(37+23) = cos 60 = 1/23.(tan46+tan24)÷(1-tan46|tan24) = tan(46+24) = tan 70等下,最后一个里面tan46|tan24 ,中间的符号啥意思?

张非致588sin45°+3tan30°+cos30°+2sin60° - 2tan45°各位大神, -
鄂例牵18358965405 ______[答案] 解sin45°+3tan30°+cos30°+2sin60°-2tan45° =√2/2+3*√3/3+√3/2+2*√3/2-2*1 =√2/2+√3+√3/2+√3-2 =5√3/2+√2/2-2

张非致588sin30°+cos180°+tan45° 求解答 求详细步骤 正在考试 急 -
鄂例牵18358965405 ______ sin30°+cos180°+tan45°=1/2-1+1=1/2

张非致588两年前教的都忘干净了.sin37cos7 - cos37sin7 cos37cos23 - sin37sin23 (tan46+tan24)÷(1 - tan46|tan24) -
鄂例牵18358965405 ______[答案] 1.sin37cos7-cos37sin7 = sin(37 - 7) = sin 30 = 1/2 2.cos37cos23-sin37sin23 =cos(37+23) = cos 60 = 1/2 3.(tan46+tan24)÷(1-tan46|tan24) = tan(46+24) = tan 70 等下,最后一个里面tan46|tan24 ,中间的符号啥意思?

张非致588sin53°cos37°+cos53°sin37°=______. -
鄂例牵18358965405 ______[答案] 原式=sin53°•sin53°+cos53°•scos53°=sin253°+cos253°=1. 故答案为1.

张非致588向量a(sin67 cos67),b(cos53 cos37) 则a*b -
鄂例牵18358965405 ______ a*b=sin67cos53+cos67cos37=sin67cos53+cos67sin53=sin(67+53)=sin120=根号(3)/2