I need to solve

This gives me complex roots. In my book they solve the equation as follows:

=

How was my approach to the problem wrong?

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- Sep 28th 2009, 07:04 AMadkinsjrTrigonometric Equation
I need to solve

This gives me complex roots. In my book they solve the equation as follows:

=

How was my approach to the problem wrong? - Sep 28th 2009, 07:13 AMpacman
http://www.mathhelpforum.com/math-he...e683d2cc-1.gif

http://www.mathhelpforum.com/math-he...e380debb-1.gif

your identity is suspect: sin^2 A + cos^2 A = 1

sin^2 A = 1 - cos^2 A

see your mistake?(Thinking) - Sep 28th 2009, 07:20 AMadkinsjr
(Giggle), ok I see it now. Thanks

- Sep 28th 2009, 07:25 AMpacman
see my graph, it will help you locate the roots