Is Cos2x the Same as Cos^2(x) in the Equation Cos2x + Cosx + 1 = 0?

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In summary, the conversation involves solving a multiple choice question involving cos2x and asking for help. One of the answers involves using the double angle identity and converting 1 to sin and cos. The conversation also mentions writing 1 in terms of sin and cos.
  • #1
aisha
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Solve please give me some help

how would you solve this question cos2x+cosx+1=0? The cos2x is throwing me off is that the same as cos^2x? Its multiple choice and all the answers are in radian how come?
 
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  • #2
1. cos(a + b) = cos(a)cos(b) - sin(a)sin(b).
2. Do you know how to write 1 in terms of sin and cos?
 
  • #3
AKG said:
1. cos(a + b) = cos(a)cos(b) - sin(a)sin(b).
2. Do you know how to write 1 in terms of sin and cos?

no i don't please help me
 
  • #4
[tex]\sin^{2}x + \cos^{2}x = 1[/tex]
 
  • #5
cos2x is not the same as cos^2x. Use a double angle identity for that one.
 
  • #6
On normal basis,u should end up with a simple quadratic equation is "\cos x"...That won't be 2 hard to solve...

Daniel.
 

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