Question

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Answer 1

i know I need to be in degree mode on calculator, but still havign problems... it is basically 12x72degrees right?

Answer 2

first tell me ur calc is of which company

Answer 3

TI-89

Answer 4

no , if your calculator is in degrees just type 12 sin(72) and the answer is Y

Answer 5

Press MODE, scroll down to "Angle", and pick "2: DEGREE".
You can get the guidbook at http://education.ti.com/educationportal/ … . It's a pdf, which means you can search through it for topics.

Hope I've helped! =)