Question

2{cos pie/5 - cos 2pie/5}

Answer 1

@amistre64 @ajprincess

Answer 2

@asnaseer @FoolForMath

Answer 3

@yahoo answer is zero

Answer 4

the answer is 1

Answer 5

oops sorry. @Yahoo! I told u the value of cos 36
so change the pies

Answer 6

I mean u write it \[2(\cos36^o-\cos2 * 36^o.)\]like this

Answer 7

the value of cos 36* is\[\sqrt{5}+1 \over 4\]

Answer 8

it is a universal result:)

Answer 9

gt it?

Answer 10

yup

Answer 11

k! so gt the answer?

Answer 12

ya then u are correct:)

Answer 13

no i am not getting 1

Answer 14

hmm.................................................

Answer 15

that was a typo

Answer 16

where?
in ur answer key. hmm ...?

Answer 17

the answer should be 1.........

Answer 18

so what should I do?
u r confusing me.
I m asking u only that u gt the answer or nt?

Answer 19

i did nt get

Answer 20

ok! let me try:)

Answer 21

what problem u r having while solving
aren't u getting the value of sin 36
? Is this the problem?

Answer 22

hey is it cos??

Answer 23

u type upto what u have solved.

Answer 24

then i will tell u.

Answer 25

?????