DLS
  • DLS
cos36?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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hartnn
  • hartnn
really ?
hartnn
  • hartnn
without calcy ?
hartnn
  • hartnn
first can u find sin 18 without calcy ?

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More answers

DLS
  • DLS
noo :/
hartnn
  • hartnn
pretty standard
hartnn
  • hartnn
let x= 18 5x = 90 3x = 90-2x now take sin on both sides.
hartnn
  • hartnn
sin 3x = sin(90-2x) sin 3x = cos 2x
hartnn
  • hartnn
now put the formula fo sin 3x and cos 2x in terms of powers of sin x only.
hartnn
  • hartnn
u get a cubic in sin x. solve it.
DLS
  • DLS
wait,theres a formula for sin3x? :P
hartnn
  • hartnn
absolutely.
DLS
  • DLS
:O
hartnn
  • hartnn
sin 3x = 3sin x - 4 sin^3 x
DLS
  • DLS
okay yes ! i remember :P
DLS
  • DLS
thanks!
DLS
  • DLS
okay I guess i can do it now
hartnn
  • hartnn
from sin 18, u get cos 36 from the formula of cos 2x in terms of sin x
hartnn
  • hartnn
good :)
DLS
  • DLS
:D

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