Friday
August 22, 2014

Homework Help: Math - Solving for Trig Equations

Posted by Anonymous on Thursday, November 22, 2007 at 5:35pm.

Solve the following equation for
0 less than and/or equal to "x" less than and/or equal to 360

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cos^2x - 1 = sin^2x
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Attempt:
cos^2x - 1 - sin^2x = 0
cos^2x - 1 - (1 - cos^2x) = 0
cos^2x - 1 - 1 + cos^2x = 0
2cos^2x - 2 = 0
(2cos^2x/2)= (-2/2)
cos^2x = -1
cosx = square root of -1

And I can't do anything with this now...what am I doing wrong?


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Textbook answers:

0, 180, 360
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