- Thread starter Eni
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View attachment 10976I don’t understand how the second (-2) (in front of the integral sign) gets into the equation. Can you please help me?

View attachment 10976

It comes from algebra (distributive property of multiplication). You know:

2 * (A + B) = 2*A + 2*B

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I beg to differ with you

View attachment 10976

It comes from algebra (distributive property of multiplication). You know:

2 * (A + B) = 2*A + 2*B

Dear Subhotosh Khan,Thank you, it seems it was much easier than I thought! Wish you a nice day!