The question is: Show that . , but I have no idea where to go from here.
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cos(x/2)=sqrt((1+cosx)/2)
Originally Posted by chickenslowfood The question is: Show that . , but I have no idea where to go from here. You need to know about half angle formula. Look at this: List of trigonometric identities - Wikipedia, the free encyclopedia
Thanks for the help. I bet those half-angle and double-angle formulas might be useful.
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