anonymous
  • anonymous
prove that sin54-sin18=1/2
Mathematics
schrodinger
  • schrodinger
See more answers at brainly.com
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

Get this expert

answer on brainly

SEE EXPERT ANSWER

Get your free account and access expert answers to this
and thousands of other questions

GoldRush18
  • GoldRush18
0.80902-0.30902=0.5 or 1/2
GoldRush18
  • GoldRush18
or should i say 0.5=1/2
anonymous
  • anonymous
@GoldRush18 u have to prove it using trigonometric functions and rules , not using calculator :D

Looking for something else?

Not the answer you are looking for? Search for more explanations.

More answers

GoldRush18
  • GoldRush18
oh ok
anonymous
  • anonymous
Use cofunction identity.
anonymous
  • anonymous
well i got cos36-sin18 and dont know what to do , can u prove it with explanation pls :)
anonymous
  • anonymous
Idk if this helps, but Sin(3theta)=3Sin(theta)-4(Sin(theta))^3 I tried using it and I got - 4 sinĀ³ 18 + 2 sin 18 - 1/2 = 0
blockcolder
  • blockcolder
Use this identity: \[\sin A-\sin B=2 \cos{\frac{A+B}{2}}\sin{\frac{A-B}{2}}\]
anonymous
  • anonymous
thanks will do that :D @blockcolder
anonymous
  • anonymous
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
blockcolder
  • blockcolder
Good job! :)

Looking for something else?

Not the answer you are looking for? Search for more explanations.