is the equation 2sin2x-cosx+4=0 possible Share with your friends Share 2 Aarushi Mishra answered this 2sin2x-cos x+4=021-cos2x-cos x+4=02-2cos2x-cos x+4=02cos2x+cos x-6=0Using quadratic formulacos x=-1±1+4×2×64cos x=-1±494cos x=-1±74cos x=-1+74 or cos x=-1-74cos x=64 or cos x=-84Biut note -1≤cos x≤1Hence,cos x≠64 and cos x≠-84The given equation is not possible as no value of -1≤cos x≤1 can satisfy itIt has no roots. -2 View Full Answer
