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solve for t

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Solve 8t-r=12t for t 2012-09-29
Monejah pose la question :
I need help solving 8t-r=12t for t
Penny Nom lui répond.
Solve for theta if 8cos^2 theta-3=1 2011-12-02
Katherine pose la question :
Hi, I have just learned to solve trigonometric problems for theta and have one specific question in order to find the solutions to my homework. I will use one example for this question. If I have 8cos^2 theta-3=1 I first divide by 8 and get cos^2theta=3/8 then I have cos theta= plus or minus the square root of 3/8 Then I assume that I plug in inverse cos (the square root of 3/8) to my calculator. How do I find the four solutions (we are typically supposed to find four, I believe?) Can you help me with finding the solution to this problem? Thank you!
Penny Nom lui répond.
 
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