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Question: differentiating a ln function

Question:differentiating a ln function

Shahrina86 15 Maple 18
differentiation log ln
August 16 2019
2

Hi I have the following ln function that I want to differentiate wrt variable c:

 

I2 := -sqrt(-c^2+1)*ln(abs((.9*sqrt(-c^2+1)-c*sqrt(1-.9^2))/(-.9*sqrt(-c^2+1)-c*sqrt(1-.9^2))))

 

When I differentiate I obtain an expression that involves 

...abs(1, (.9*sqrt(-c^2+1)-.4358898944*c)/(-.9*sqrt(-c^2+1)-.4358898944*c))...

Why does it give a comma at the abs expression? how to get rid of that.
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