how do i solve cos2x-cosx=0 where the interval is 0 (less than or equal to) x (less than or equal to) 2 pi

Question

fibonaccichick666 · Answer

can you change the cos2x into something different?

sanjanap · Answer

x= pi/2

anonymous · Answer

@fibonaccichick66 i dont think so

anonymous · Answer

and @SanjanaP how did you get that

fibonaccichick666 · Answer

Have you learned double angle identities?

fibonaccichick666 · Answer

if not, I recommend looking that up to begin

anonymous · Answer

i have the formulas for double angle identities yes

fibonaccichick666 · Answer

that is how you get rid of the 2x to begin

anonymous · Answer

have u learned the double angle formulas, cause thats how we can start

fibonaccichick666 · Answer

so please, re-write the eq, using it

anonymous · Answer

im not sure how to apply the formulas to this problem. if you dont mind, can you explain it?

fibonaccichick666 · Answer

well, what does cos2x=? by definition

anonymous · Answer

2sinxcosx

fibonaccichick666 · Answer

for cosine?

fibonaccichick666 · Answer

anonymous · Answer

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