1/3.14159265358979323846264338327950288.
Or 0.31830988618379067153776752674503
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1/pi = 0.3183098861837906715377675267450287240689192914809128974953346881177935952684530701802276055325061719121456854535159160737858236922291573057559348214633996784584799338748181551461554927938506153774347857924347953233867247804834472580236647602284453995114318809237801738053479122409788218738756881710574461998928868004973446954789192217966461935661498123339729256093988973043757631495731339284820779917482786972199677361983999248857511703423577168622350375343210930950739760194789207295186675361186049889932706106543135510064406495556327943320458934962391963316812120336060719962678239749976655733088705595101400324813551287776991426217602443987522953627555294757812661360929159569635226248546281399215500490005955197141781138055935702630504200326354920418496232124811229124062929681784969183828704231508151124017430532136044343182815149491654451954925707997503106587816279635448187165095941466574380813999518153154156986940787179656174346851280733790233250914118866552625373000522454359423064225199009...It is an irrational number (moreover, it is a transcendental number)
Don't know about the "following" but any irrational added to its additive inverse is 0, which is rational. Therefore, the set of irrationals is not closed under addition.
These are the for inverse operations:Multiplications inverse is divisionDivisions inverse is multiplicationAdditions inverse is subtractionSubtractions inverse is addition
There is no inverse for zero.
The inverse of sin inverse (4/11) is simply 4/11.