Math Problem Statement
найдите значение выражения ctg2a если sina= 1/5
Solution
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Math Problem Analysis
Mathematical Concepts
Trigonometry
Double Angle Formulas
Trigonometric Identities
Formulas
sin^2(a) + cos^2(a) = 1
cot(2a) = (1 - tan^2(a)) / (2 * tan(a))
tan(a) = sin(a) / cos(a)
Theorems
Pythagorean identity
Double-angle identity for cotangent
Suitable Grade Level
Grade 10-12
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