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Jan20-12, 03:52 PM
Sci Advisor
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P: 25,235
Quote Quote by chapsticks View Post
okay how about this answer??

f'(x)=arcsec4x+ 4/(4x(√(16x)2-1)
Stop changing things without giving any reason. Why did you put the arcsec4x in there? Why did you drop the absolute value on |4x|? (4x)^2 was right, (16x)^2 isn't. Why not?