Sin10°cos60°sin50°cos20°sin90°不查表求值

来源：学生作业帮编辑：拍题作业网作业帮分类：数学作业时间：2024/04/20 10:17:25

SIN10°SIN30°SIN50°SIN70°SIN90°=(1/2)*SIN10°SIN50°SIN70°
=(1/4)*2COS10°SIN10°SIN50°SIN70°/COS10°
=(1/4)*SIN20°SIN50°SIN70°/COS10°
=(1/8)*2COS20°SIN20°SIN50°SIN70°/(COS10°COS20°)
=(1/8)*SIN40°SIN50°SIN70°/(COS10°COS20°)
=(1/16)*2COS40°SIN40°SIN50°SIN70°/(COS10°COS20°COS40°)
=(1/16)*SIN80°SIN50°SIN70°/(COS10°COS20°COS40°)
=1/16

Sin10°cos60°sin50°cos20°sin90°不查表求值求值sin10度cos20度sin30度cos40度sin50度cos60度sin70度cos80度sin90度 sin10°sin50°为什么等于1/2(cos40-cos60) 求值：sin10°sin50°sin70°sin80° 求值：sin10°sin50°·sin70° sin10°sin50°sin70° 怎样化简求值? 正弦函数求值sin10°*sin50°*sin70° sin70°cos20°-sin10°sin50°的值是多少?,麻烦给出过程化简[2sin50°+sin10°(1+3tan10°)]1+cos20° cos20°cos10°+sin10°sin10° sin40°*(1-sin10°)/[sin10°*(cos20°)^2] 求值:[sin50°(1+tan10°√3)-cos20°]/[cos80°乘以根号下1-cos20°]