cos(2tan^-1 1/5) *evalutate the expression without using a calculator

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter5: Inverse, Exponential, And Logarithmic Functions
Section: Chapter Questions
Problem 44RE
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cos(2tan^-1 1/5)

*evalutate the expression without using a calculator

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cos(2tan^-1 (1/5))

Evaulate the expression without using a calculator.

*the -1 is attached to the tangent as an exponent. sorry if i made it seem like 115.

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