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Sin x +Cos x= 21/2 Sin x.Then Cos x – Sin x=?
cosx – sinx = + 21/2cosx
let cosx-sinx=k, sinx +cosx= 21/2sinxsquare and add both eq. u get1+1=2sin2x+k2 …............as sin2x+cos2x=1solve it ….......... APPROVE IF USEFUL!!!!!!!!!!!!!!!
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