1.

For every function f (x) which is twice differentiable , these will be good approximation ofint_(a)^(b)f(x)dx=((b-a)/(2)){f(a)+f(b)},for more acutare results forcin(a,b),F( c) = (c-a)/(2)[f(a)-f( c)]+(b-c)/(2)[f(b)-f( c)]Whenc= (a+b)/(2)int_(a)^(b)f(x)dx=(b-a)/(4){f(a)+f (b)+2 f ( c) }dxIff''(x)lt0,AAx in(a,b), and (c , f(c )) is point of maxima , wherec in (a,b) , then f ' ( c)is

Answer»

`(F(b)-f(a))/(b-a)`
`3[(f(b)-f(a))/(b-a)]`
`2[(f(b)-f(a))/(b-a)]`
0

Solution :F '( C) = ( b-a) f ' ( c) + f(a) - f (b)
`F'' ( c) = f '' (c ) (b -a) lt 0`
`RARR F' ( c) = 0 rArr f '( c) = (f(b)-f(a))/(b-a)`


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