Q. 125.0( 1 Vote )

# Evaluate: <span l

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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