Math Problem Statement
已知tan α=3,则cos(2α+pi/3)等于
Solution
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Math Problem Analysis
Mathematical Concepts
Trigonometry
Double Angle Formulas
Angle Addition Formulas
Formulas
tan(α) = sin(α) / cos(α)
cos(2α) = cos^2(α) - sin^2(α)
cos(A + B) = cos(A)cos(B) - sin(A)sin(B)
sin^2(α) + cos^2(α) = 1
Theorems
Pythagorean Identity
Angle Addition Formula
Suitable Grade Level
Grades 10-12