Given that (b-2)**2=0, how much is b**2-3=.
已知(b-2)**2=0，则b**2-3=多少．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">4 - 3</gadget>
<output>1</output>

<result>1</result>