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B
log(x+y)=x−y+c.
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C
log(x+y)=x−y−c.
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D
None of these
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Solution
The correct options are Blog(x+y)=x−y−c. Clog(x+y)=x−y+c. Given, (x+y)(dx−dy)=dx+dy. (x+y+1)dy=(x+y−1)dx dydx=x+y−1x+y+1. ⇒dx+dyx+y=dx−dy. Integrating we get, log(x+y)=x−y+c.