A.\(\sin {15^ \circ } = \dfrac{{\sqrt 6 + \sqrt 2 }}{4}\)
B.\(\cos {15^ \circ } = \dfrac{{\sqrt 6 - \sqrt 2 }}{4}\)
C.\(\cos {75^ \circ } = \dfrac{{\sqrt 6 + \sqrt 2 }}{4}\)
D.\(\cos {75^ \circ } = \dfrac{{\sqrt 6 - \sqrt 2 }}{4}\)
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Hóa Học lớp 12
