If f(x)=a|sinx|+be|x|+c|x|3 and if f(x) is differentiable at x=0, then
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a
a=b=c=0
b
a=0,b=0,c∈R
c
b=c=0,a∈R
d
c=0,a=0,b∈R
answer is B.
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Detailed Solution
If x≥0 then fx=a sin x + b ex + c x3 f'(x)=a cos x + b ex + c 3x2 f'0+= a + b + 0 = a + b If x<0 then fx = -a sinx + b e-x-c x3 f'x =-a cos x - b e-x -3cx2 f' 0-= -a -b since f is differentiable at x = 0 , f'0+ =f'0- ⇒ a+b = -a-b ⇒ a + b = 0 and c ∈ R so option is (2)