SOLUTION: Solve these equations algebraically. Find all solutions of each equation in the interval [0,2pi). Show all your work. Use exact answers for pi/6, pi/4, pi/3 angles etc. (If you are
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Question 1131255: Solve these equations algebraically. Find all solutions of each equation in the interval [0,2pi). Show all your work. Use exact answers for pi/6, pi/4, pi/3 angles etc. (If you are using your calculator, check to make sure you are in radian mode.)
2. sin2x+cosx=0
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
\ +\ \cos(x)\ =\ 0)
\cos(x)\ +\ \cos(x)\ =\ 0)
\[2sin(x)\ +\ 1\]\ =\ 0\ )
\ =\ 0\ \Right\ x\ \in\ \{0,2\pi\})
\ +\ 1\ =\ 0\ \Right\ \sin(x)\ =\ -\frac{1}{2}\ \Right\ x\ \in\ \{\frac{7\pi}{6},\frac{11\pi}{6}\})
John
My calculator said it, I believe it, that settles it
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