设a为常数,解方程cox(x-45度）＝sin(2x)+a设a为常数，解方程cos(x-π/4）＝sin(2x)+a_数学解答

设a为常数,解方程cox(x-45度）＝sin(2x)+a
设a为常数，解方程cos(x-π/4）＝sin(2x)+a

人气：239 ℃　时间：2020-04-16 04:55:56

解答

cos(x-π/4)=sin2x+acosxcos(π/4)+sinxsin(π/4)=2sinxcosx+a(根号2/2)*cosx+(根号2/2)*sinx=2sinxcosx+a(根号2/2)(cosx+sinx)=2sinxcosx+a两边同时平方,得:(1/2)(cosx+sinx)^2=(2sinxcosx+a)^2(1/2)[sin^2(x)+cos^...