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4 votes

cos(x)/(2) =±
\sqrt{(1+cosx)/(2) }, if A=
(x)/(2) then cosA=

User Alok P
by
8.3k points

1 Answer

4 votes

Answer:


cos(A)=\pm\sqrt{(1+cos(x))/(2)}

Explanation:


cos(A)=\cos{(x)/(2)}=\pm\sqrt{(1+cos(x))/(2)}

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

User Gabie
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