Question 924298
{{{(tan(t)+1)(tan(t)-1)=0}}}
Two solutions:
{{{tan(t)+1=0}}}
{{{tan(t)=-1}}}
{{{t=(3/4)pi}}} and {{{t=(7/4)pi}}}
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{{{tan(t)-1=0}}}
{{{tan(t)=1}}}
{{{t=(1/4)pi}}} and {{{t=(5/4)pi}}}