B
bun123


cos2.2x−3sin2x=cosx.cos3x
cos4x=8cos4x−8cos2x+1
:khi (58)::khi (122)::khi (122)::khi (186)::khi (79)::khi (79):
giup minh voi, minh yeu luong giac nay lam
cos4x=8cos4x−8cos2x+1
:khi (58)::khi (122)::khi (122)::khi (186)::khi (79)::khi (79):
giup minh voi, minh yeu luong giac nay lam
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