Solve each of the following equations for (i)

(ii)

**Answer (i):**

Solve

Assuming u=2x,

Now

As ,

or,

Answer (ii):

Solve

We know that,

Substituting the value of in , we get,

or,

or,

or,

or,

or, or

or, or

or,

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Solve each of the following equations for (i)

(ii)

**Answer (i):**

Solve

Assuming u=2x,

Now

As ,

or,

Answer (ii):

Solve

We know that,

Substituting the value of in , we get,

or,

or,

or,

or,

or, or

or, or

or,

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