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hartnnBest ResponseYou've already chosen the best response.1
first can u find sin 18 without calcy ?
 one year ago

hartnnBest ResponseYou've already chosen the best response.1
let x= 18 5x = 90 3x = 902x now take sin on both sides.
 one year ago

hartnnBest ResponseYou've already chosen the best response.1
sin 3x = sin(902x) sin 3x = cos 2x
 one year ago

hartnnBest ResponseYou've already chosen the best response.1
now put the formula fo sin 3x and cos 2x in terms of powers of sin x only.
 one year ago

hartnnBest ResponseYou've already chosen the best response.1
u get a cubic in sin x. solve it.
 one year ago

DLSBest ResponseYou've already chosen the best response.1
wait,theres a formula for sin3x? :P
 one year ago

hartnnBest ResponseYou've already chosen the best response.1
sin 3x = 3sin x  4 sin^3 x
 one year ago

DLSBest ResponseYou've already chosen the best response.1
okay I guess i can do it now
 one year ago

hartnnBest ResponseYou've already chosen the best response.1
from sin 18, u get cos 36 from the formula of cos 2x in terms of sin x
 one year ago
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