Answer :



Let



&


So, I = I1 + I2 + I3 …(i)


Solving I1,



We know that,










I1 = 12 – 4 = 8


Solving I2,



We know that,











I2 = 9 – 4 = 5


Solving I3,



We know that,











I3 = 4


Putting the values of I1, I2, I3 in Eq. (i), we get


I = 8 + 5 + 4


= 17


OR


Let


Apply the property







Now, let cosx = t


- sinx dx = dt


sinx dx = -dt


when x = 0,


then, cos (0) = t t = 1


and when x = π,


then, cos (π) = t t = -1




Now, we know that,










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