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Question
If a = xm + n. yl ; b = xn + l. ym and c = xl + m. yn,
Prove that : am - n. bn - l. cl - m = 1
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Solution
a = xm + n. yl
b = xn + l. ym
c = xl + m. yn
am - n. bn - l. cl - m = 1
LHS
= am - n. bn - l. cl - m
= [ x( m + n ). yl ]( m - n ) . [ x( n + l ). ym ]( n - l ) . [ x( l + m ) . yn ]( l - m )
= x( m + n )( m - n ). yl( m - n ) . x( n + l )( n - l ). ym( n - l ) . x( l + m )( l - m ). yn( l - m )
= `x^( m^2 - n^2 + n^2 - l^2 + l^2 - m^2 ) . y^( lm - ln + mn - ml + nl - nm )`
= `x^0 . y^0`
= 1
= RHS
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