<p>The nspire is more pre-calc / lower level calc oriented, whereas the 89 is good for higher level / engineering calc. If you want to graph in 3 dimensions, buy the 89. If you want to make integral calculus easier, buy the nspire.</p>
<p>[TI-nspire</a> FAQ](<a href=“http://www.ti-nspire.com/tools/nspire/resources/faq_background.html]TI-nspire”>http://www.ti-nspire.com/tools/nspire/resources/faq_background.html)</p>
<p>There’s a small Ti-89 vs. Ti-nspire section there.</p>
<p>I suggest you just use a scientific calculator for high school calc. If you can’t differentiate without the aid of a calculator, then you shouldn’t be taking that class.</p>