Question 830586
Period of y=tan(x) is {{{pi}}}.
However the 2 multiplier in {{{tan(2x-1)}}}, halves the period to {{{pi/2}}} just as {{{tan(x/2)}}} would double the period. 
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{{{ graph( 300, 300, -2, 2, -20, 20, 3*tan(2x-1)) }}}