63. 3a -a + b watch |-b+a 36 -b+c= ...
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63. 3a -a + b watch |-b+a 36 -b+c= 3(a + b + c) (ab + bc + ca). l-eta -c+b 30 , '64. I a b c | a - b b-c c-a = a + b3 + c3 – Babci lb + c cta at

11th - 12th Class
Maths
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( left[begin{array}{ccc}3 a & -a+b & -a+c a-b & 3 b & c-b a-c & b-c & 3 cend{array} midright. ) ( fleft(begin{array}{ccc}3 a & -a+b & -a+c a-b & 3 b & c-b a-c & b-c & 3 cend{array} midright. ) We kesite column ( c_{1} Rightarrow c_{1}+c_{2}+c_{3} ) ( left|begin{array}{ccc}a+b+c & -a+b & -a+c a+b+c & 3 b & c-b a+b+c & b-c & 3 cend{array}right| ) ( =(a+b+c)left|begin{array}{ccc}1 & -a+b & -a+c 1 & 3 b & c-b 1 & b-c & 3 cend{array}right| ) ( R_{2} rightarrow R_{2}-R_{B} quad R_{3} Rightarrow R_{3}-R_{1} ) ( (a+b+c)left|begin{array}{ccc}1 & -a+b & -a+c 0 & 2 b+a & a+b 0 & a-c & 2 c+aend{array}right| ) ( (a+b+c)(1(2 b+a)-(2 c+a)-(a-b)(a-c)] ) ( (a+b+c)[3 b c+3 a b+3 a c] ) ( 3(a+b+c) quad(a b+b c+c e c) ) Henee kee parcect it a nudd
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