Tính các góc của \(\Delta ABC\) biết \(\left( {1 + \frac{1}{{\sin A}}} \right)\left( {1 + \frac{1}{{\sin B}}} \right)\left( {1 + \frac{1}{{\sin C}}} \right) = {\left( {1 + \frac{1}{{\sqrt[3]{{\sin A\sin B\sin C}}}}} \right)^3}\).
A.\(\angle A = \angle B = \angle C = {60^0}\)
B.\(\angle A = {90^0}\,\,;\,\,\angle B = {30^0}\,\,;\,\,\angle C = {60^0}\)
C.\(\angle A = {90^0}\,\,;\,\,\angle B = \angle C = {45^0}\)
D.\(\angle A = {120^0}\,\,;\,\,\angle B = \angle C = {30^0}\)
A.\(\angle A = \angle B = \angle C = {60^0}\)
B.\(\angle A = {90^0}\,\,;\,\,\angle B = {30^0}\,\,;\,\,\angle C = {60^0}\)
C.\(\angle A = {90^0}\,\,;\,\,\angle B = \angle C = {45^0}\)
D.\(\angle A = {120^0}\,\,;\,\,\angle B = \angle C = {30^0}\)
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Hóa Học lớp 12
