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GoldRush18Best ResponseYou've already chosen the best response.0
0.809020.30902=0.5 or 1/2
 one year ago

GoldRush18Best ResponseYou've already chosen the best response.0
or should i say 0.5=1/2
 one year ago

hossam1122Best ResponseYou've already chosen the best response.0
@GoldRush18 u have to prove it using trigonometric functions and rules , not using calculator :D
 one year ago

hossam1122Best ResponseYou've already chosen the best response.0
well i got cos36sin18 and dont know what to do , can u prove it with explanation pls :)
 one year ago

MelindaRBest ResponseYou've already chosen the best response.1
Idk if this helps, but Sin(3theta)=3Sin(theta)4(Sin(theta))^3 I tried using it and I got  4 sin³ 18 + 2 sin 18  1/2 = 0
 one year ago

blockcolderBest ResponseYou've already chosen the best response.1
Use this identity: \[\sin A\sin B=2 \cos{\frac{A+B}{2}}\sin{\frac{AB}{2}}\]
 one year ago

hossam1122Best ResponseYou've already chosen the best response.0
thanks will do that :D @blockcolder
 one year ago

hossam1122Best ResponseYou've already chosen the best response.0
thanks i got it now it should be like this 2cos(36)sin(18) and multiply by cos18/cos18 as it equals 1 so cos(36)sin(36)/cos(18) and then multiply by 2 and 1/2 so 1/2sin72/cos18 then use co function so sin72= cos18 1/2cos(18)/cos(18) cosines cancel each other so = 1/2
 one year ago
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