Question

Why do you think it is usually preferable to start with the side containing the more complicated expression when establishing an identity?

Short answer

It is preferred because that side can be reduced to simple form is some steps using different algebraic formula and identities.

Step-by-step solution

Step 1. Given Information

The given information is that it is usually preferable to start with the side containing the more complicated expression when establishing an identity

Step 2. Explanation

It is always preferred first to solve the complicated side of the equation as it can be reduced to simple form in some steps, using different algebraic formula and trignometric identity.

Whereas the simplest one can not be further broken down in simple form. They are already present in the simplest form.