TÍNH TÍCH PHÂN $ \INT\LIMITS_0^{\FRAC{\PI }{4}} {XC{\RM{OS}}2XDX}$ BẰNG:
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Level:
Medium
Question Types: Multiple choice
Answers:
- $ \\\frac{{\\\pi - 2}}{8}$.
- $ \\\frac{{\\\pi - 1}}{4}$.
- $ 3 - \\\frac{\\\pi }{2}$.
- $ 2 - \\\frac{\\\pi }{2}$.