Evaluate :

`( a + 1 ) ( a - 1 ) ( a^2 + 1 )` is equal to

Evaluate : 1 + 1/ ( 1 + 1/ ( 1 + 1/3 ) is equal to :

Evaluate : ( 2^(-1 ) + 3^(-1 ) + 5^(-1 ) )^( 0 ) is equal to

Evaluate : { ( x^n )^(n-1 ) }^(1/( n(n-1 )) is equal to

Evaluate : ( -1/2 )^(-1 ) is equal to

Find 1.8×8 is equal to

Evaluate : a^(-1 ) is equal to

Evaluate : x^2 - ( 1 - x )^2 is equal to:

Evaluate : ( 1/2 - 1/3 ) + ( 1/3 - 1/4 ) + ( 1/4 + 1/2 ) is equal to ( a ) 0 ( b ) 1/4 ( c ) 1/2   ( d ) 1