Question

cos20cos40cos80 = 1/8
Prove the identity sorry

Answer 1

@campbell_st

Answer 2

@ikram002p

Answer 3

always tag me when im having breakfast xD

Answer 4

sorry what country u from cos im in Australia and its 5pm

Answer 5

should u use identity ?
cuz u can find this from calculator
x= 1/ (cos20cos40cos80 )

Answer 6

ye identity

Answer 7

sorry let me rephrase the question osorry

Answer 8

@ikram002p any ideas?

Answer 9

@ikram002p are u still there

Answer 10

\[\frac{ 3 }{4}\cos 20 - \frac{ \sqrt{3} }{2} \sin 20\]