TẬP NGHIỆM CỦA PHƯƠNG TRÌNH $ \COS 2X = \FRAC{1}{2}$ LÀ:
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Level:
Medium
Question Types: Multiple choice
Answers:
- $ x = \\\pm \\\frac{\\\pi }{6} + k\\\pi ,\\\left( {k \\\in \\\mathbb{Z}} \\\right).$
- $ x = \\\frac{\\\pi }{6} + k\\\pi ,\\\left( {k \\\in \\\mathbb{Z}} \\\right).$
- $ x = \\\pm \\\frac{\\\pi }{6} + k\\\pi ,\\\left( {k \\\in \\\mathbb{N}} \\\right).$; $ \\\left( {AA'D'D} \\\right)$
- $ x = \\\pm \\\frac{\\\pi }{3} + k2\\\pi ,\\\left( {k \\\in \\\mathbb{Z}} \\\right).$