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[tex]cos\frac{x}{2} =[/tex]±[tex]\sqrt{\frac{1+cosx}{2} }[/tex], if A=[tex]\frac{x}{2}[/tex] then cosA=

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sqdancefan

Answer:

  [tex]\cos{A}=\pm\sqrt{\dfrac{1+\cos{x}}{2}}[/tex]

Step-by-step explanation:

[tex]\cos{A}=\cos{\frac{x}{2}}=\pm\sqrt{\dfrac{1+\cos{x}}{2}}[/tex]

Apparently, you're supposed to recognize that the formula tells you the value of cos(x/2).

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