If tan (x) = 6/8, what is cos (2x), given that 0 < x < (pi/2).

Algebra and Trigonometry (MindTap Course List)
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Author:James Stewart, Lothar Redlin, Saleem Watson
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Chapter5: Trigonometric Functions: Right Triangle Approach
Section5.4: Inverse Trigonometric Functions And Right Triangles
Problem 1E: For a function to have an inverse, it must be ___________. To define the inverse sine function, we...
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If tan (x) = 6/8, what is cos (2x), given that 0 < x < (pi/2). 
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