Use the substitution to solve the equation

the problem i need explaining is the first part involving the subsitution for . how does become

.....

i can see how the rest of the problem is solved as i have the solution

many thanks

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- Mar 7th 2010, 04:56 AMdecoy808explaination required
Use the substitution to solve the equation

the problem i need explaining is the first part involving the subsitution for . how does become

.....

i can see how the rest of the problem is solved as i have the solution

many thanks - Mar 7th 2010, 05:30 AMProve It