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TrueStar
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Homework Statement
Solve for t
sin3tcost+cos3tsint=-1/2
Homework Equations
Sum and Difference Identities
The Attempt at a Solution
I saw this problem the the sum identity sin([itex]\alpha[/itex]+[tex]\beta[/tex]) looked like the way to begin solving for t.
This condenses to sin(3t+t)= -1/2 which is sin(4t)= -1/2
I let 4t=x and now have sin x= -1/2
The answers for this are 7[itex]\pi[/itex]/6+2[itex]\pi[/itex]n and 11[itex]\pi[/itex]+2[itex]\pi[/itex]n.
This means that 4t equals both 7[itex]\pi[/itex]/6+2[itex]\pi[/itex]n and 11[itex]\pi[/itex]+2[itex]\pi[/itex]n. I need to divide the four out to get t by itself.
The general solutions (I think) are t=7[itex]\pi[/itex]/24+[itex]\pi[/itex]n/2 and 11[itex]\pi[/itex]/6+[itex]\pi[/itex]n/2.
Did I miss anything or does this look correct?
Thanks!