Sunday, September 19, 2010

8-5

The easiest section this week was by far section 8-5. It was really just a carryover of 8-1 with some add on with trig identities from 8-4. If this isn’t possible you change into tan or cot by either putting sin over cos or by putting cos over sin. If this step is not required it is just as simple as getting the trig function by itself and taking an inverse. You may have to divide by another number if there is one but if not you find the quadrants where the answers lie and perform the operations to figure them out.

Ex.
7cosA=4
Divide by 7

cosA=4/7
divide by cos or in better words take the inverse

A=cos^-1(4/7)
You get 55.15.

Since cos is positive in the I and IV Quadrant you take the original value, make it negative and add 360.
 Your two answers ar 55. 15 and 304.85

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