If R = ( a^3 + 1 )/( a - 1 ) and S = ( a...

If `R = ( a^3 + 1 )/( a - 1 )` and S = `( a^2 - a + 1 )/ ( a + 1 )` , then R ÷ S is :
( a ) `( a - 1 ) / ( a + 1 )` ( b ) `1 / ( a^2 + a + 1 )` ( c ) 1 ( d ) `( a + 1 )^2 / ( a - 1 )`

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