consdier the function:

f(x) = (sin3x)/x , x<0

a + 1 , x=0

be^(-2x), x>0

a.)explain why f(x) is continuous for all real x =/ 0 (=/ mean does not equal..sry dunno how to type the sign)

b.)using limits, determine the values of a and b that make f(x) continuous at x = 0

plz help!

thx