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The TI-30XPlus MathPrint can do measurement conversions, plus it has a stack of scientific constants stored, and it does exact values, defines functions, remembers the data that you enter (lists) and it's cheaper. Officeworks beat any price by 5%, so check out Haines education, get OW to price...

Here's an example with exact logarithms

Yes, TI-30XPlusMathPrint can do custom logs, exact values, define functions ... even approximate integrals if you like.

UR excited about FX8200AU - scroll further down the list of approved calculators ... you will find a more powerful and much cheaper model: TI-30XPlusMathPrint. It too does exact values, defines functions f(x), g(x), numerical differentiation, normal and binomial distributions ... scientific...

Chain rule is not necessary for this question. Functions of the form e^g(t) differentiate as g'(t).e^f(t). In other words, you can differentiate the exponent and put it out the front of g(t) ... much quicker! BTW - You might also like to check out a new calculator approved for NSW HSC exams...