Let's rewrite the integrand by completing the square for ,
Now apply integral substitution,
Let u=x+1,
Now again apply the integral substitution,
Let u=sec(v),
Now use the identity:
assuming
Using the identity:
Apply the sum rule,
Now let's evaluate the first integral by applying the integral reduction,
Now use the common integral:
Now plug back the above integral and the common integral,
Now substitute back:
Now
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