Determine whether the pairs of functions in Problems 20 through 26 are linearly independent or linearly dependent on the real line. 20. f(x) = g(x) = cos? x + sinx 21. f(x)=x,8() = x+|x| 23. f(x) = xe", g(x) = |x|e" 22. f(x) = 1 + x, 8(x) = 1 + x 24. f(x) = sinx, g(x) = 1 - cos 2x 25. f(x) = e sinx, g(x) = e* cos x 26. f(x) = 2 cos x + 3 sinx, g(x) = 3 cos x - 2 sin x