a ⎣ ⎢ ⎢ ⎢ ⎡ b ( 2 + 4 + x ) b − d c ( 2 + 4 + x ) d + f e ( 2 + 4 + x ) f ⎦ ⎥ ⎥ ⎥ ⎤
Ignoring the arbitrary constant, the antiderivative of function 2 + 4 + x can be written as the expression given above for positive integers a , b , c , d , e , f with gcd ( c , d ) = gcd ( e , f ) = 1 .
What is the value of a + b + c + d + e + f ?
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hey is this problem really of level 5 !!!! ?
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Well I can't do anything about its level .
I think this is one of those problems that just looks hard, but really isn't.
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∫ 2 + 4 + x . d x L e t 2 + 4 + x = t t 2 − 2 = 4 + x ( ( t 2 − 2 ) 2 − 4 ) 2 = x x = ( t 4 − 4 t 2 ) 2 d x = 2 ( t 4 − 4 t 2 ) ( 4 t 3 − 8 t ) . d t N o w t h e i n t e g r a l b e c o m e s ∫ 2 t ( t 4 − 4 t 2 ) ( 4 t 3 − 8 t ) . d t 8 ∫ ( t 8 − 6 t 6 + 8 t 4 ) d t 8 [ 9 2 + 4 + x 9 − 7 6 2 + 4 + x 7 + 5 8 2 + 4 + x 5 ] + k B y t h i s w e g e t a + b + c + d + e + f = 8 + 9 + 6 + 7 + 8 + 5 = 4 3