化简! sin2x/n*conx
答案怎么老是不对!
让我来把,这是智力题, sin2X/2ncosX=2sinXcosX/2ncosX=SinX/n=SiX=6 哈哈,承让了.
sin2x/2ncosx =2sinxcosx/2ncosx =sinx/n
1、sin2x/(n×cosx ) = (1/n)2sinxcosx/cosx = (2/n)sinx 2、(sin2x/n)×cosx = (1/n)sin2xcosx = (1/n)2sinx(cosx)^2 = (2/n)sinx[1 - (sinx)^2] = (2/n)sinx(1 + sinx)(1 - sinx)
答:sin2X/2ncosX =2sinxcosx/2ncosX =six 6详情>>
问:小华5/1小时行了3/2千米他行1千米需要多少小时,他行1小时可行多少千米?(为...
答:1/5÷2/3=1/5×3/2=3/10小时详情>>
问:甲车每小时行38km乙车每小时行41km甲乙车同时两地开岀相向行了2.5小时后相...
答:(38+41)x2.5=197.5千米详情>>