2. The integral expression 4 tan (3x) dx /4 and the summation expression limdak- /4 tan (3xk) Axk; a = -/4, b = /4 k=-/4 are equivalent in every way except that... the limit should be changed to limx. O the upper and lower bounds on the summation should be changed from " k = /4" and " /4" to " k = 1" and "n", respectively. some change needs to be made, not mentioned above. Both a and b should be implemented. O Niether a nor b should be implemented; the two expressions are equivalent.