A Question For The Math II SAT II

Test Preparation SAT Subject Test Preparation
1

<p>Does anyone know mnemonics that could help one remember trig identities for the exam? I know my pythagorean identities because I know how to develop them from a triangle with a hypotenuse of 1, but I am at a loss as to how to memorize the rest.</p>

2

<p>you program them in your calculator. Best way of memorizing.</p>

3

<p><_<;</p>

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<p>And what would be the best way to put trigonometric identities into a school loaned TI-84+ that came without software or a cable? ^_^;</p>

<p>Thanks a lot!</p>

4

<p>you don't need software or a cable. you can just type them in your calculator by creating a new program</p>

5

<p>There aren't many questions that explicitly ask for the use of trig identities. At most, you'll find two or three questions that require any type of knowledge of them.</p>

<p>However...here's one to remember cos (a +/- b):
cosine, cosine, sine, sine; switch the sign...meaning that cos (a+b) = cos a cos b - sin a sin b and cos (a-b) = cos a cos b + sin a sin b.</p>

<p>But, as suggested above, you can just program the identities into your calculator. It might be a little time-consuming, but if it'll get you that extra point, go for it.</p>

6

<p>And actually when you try to put it, you will keep reviewing the stuff and thus memorize them. Then you will realize in the exam that you remember them all!</p>

7

<p>the only ones you really need to know are sin2theta + cos2theta = 1
and tan= sin/cos. I got by without knowing the other ones.</p>

8

<p>you can derive all the ones that you really need to know from (sinx)^2 + (cosx)^x = 1 (divide everything by cosx to get (tanx)^2 + 1 = (csc)^2</p>

9

<p>You could type it into notepad... :)</p>

10

<p>law of cosines is c^2 = a^2 + b^2 - 2ab*cosC. there was a question on this month's SAT that required it.</p>