If   `f(x)={[(sin7x)/(3x),x!=0 or m if x=0]}` is continuous at x=0 then value of m is
(a) 3/7
(b) 4/7
(c) 7/4
(d) 7/3

f(x)=(x sin 6x)/(tan 5x tan 7x) " for " x!=0, is continuous at x = 0 if f(0) = ….

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Evaluate: Lim_(x rarr0)[(sin7x)/(3x)]