Math Problem Statement
tìm min max y=cosx+2cos2x
Solution
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Math Problem Analysis
Mathematical Concepts
Trigonometry
Calculus
Maxima and Minima
Formulas
y = cos(x) + 2cos(2x)
First derivative: y' = -sin(x) - 4sin(2x)
Double angle formula: sin(2x) = 2sin(x)cos(x)
Theorems
Critical points via first derivative
Extreme Value Theorem
Suitable Grade Level
Grades 11-12 (Advanced High School) / Early University Level
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