Raise to the power of .

Raise to the power of .

Multiply by .

Subtract from .

Rewrite as .

Pull terms out from under the radical, assuming positive real numbers.

Evaluate square root of 13^2-12^2

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# Evaluate square root of 13^2-12^2

Raise to the power of .

Raise to the power of .

Multiply by .

Subtract from .

Rewrite as .

Pull terms out from under the radical, assuming positive real numbers.

Evaluate square root of 13^2-12^2