Given that 
= 
the value of 
is
In this question we use the method of partial fraction
1 = A(x2 + 9) + B(x2 + 4)
A + B = 0, 9A + 4B = 1
A = 15, B = -15
1
Given that = the value of is
In this question we use the method of partial fraction
1 = A(x2 + 9) + B(x2 + 4)
A + B = 0, 9A + 4B = 1
A = 15, B = -15