Toán Lớp 11: giúp mik 4 câu này vs mn
a)2sin^2(2)x+5sin2x+2=0
b)2cos^2-3cosx-2=0
c)4cos^2x+4cosx-3=0
d)2cos^2x-5cosx-3=0
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Toán Lớp 11: giúp mik 4 câu này vs mn
a)2sin^2(2)x+5sin2x+2=0
b)2cos^2-3cosx-2=0
c)4cos^2x+4cosx-3=0
d)2cos^2x-5cosx-3=0
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