1. <b> x 2 ln(x)</b> 2. <b> 5e x log a x</b> 3. <b> log 10 x</b> 4. <b> log a x</b> 5.<b> a x ln(x) + b e x sin x</b> 6. x 2 log a x - x 3 lna x + 6xe x ln(x) 7. \[\frac{x}{x^2 + a^2}\] 8. \[\frac{1 - tan x}{1 + tan x}\] 9. \[\frac{1 + sin x}{1 + cos x}\] 10. \[\frac{1 + sin x}{1 - sin x}\] 11. \[\frac{cos x - cos 2x}{1 - cos x}\] 12. \[\frac{sin x + cos x}{\sqrt(1 + sin 2x)}\]
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