Andrew M. answered • 06/16/15

Mathematics - Algebra a Specialty / F.I.T. Grad - B.S. w/Honors

Garen T.

asked • 06/16/15The π next to the 5 is pi.

pls explain

More

Andrew M. answered • 06/16/15

Tutor

New to Wyzant
Mathematics - Algebra a Specialty / F.I.T. Grad - B.S. w/Honors

f(x) = sin(x)

Basically this means that to perform the function you

take the sine of whatever is inside the parentheses

f(5pi/3) = sin(5pi/3)

Note this is in radians so on your scientific calculator make sure

you are set to work in radians, not degrees

= -0.866

depending on how many decimal places you need to round to

Note this is the same answer Michael got since

-√3/2 = -0.866

Michael J. answered • 06/16/15

Tutor

5
(5)
Understanding all Sines of Triangles

Let ? = x

f(x) = sin(x)

Substitute x = 5π/3

f(5π/3) = sin(5π/3)

= sin(300) ----> in degrees

= sin(360 - 60)

Using the subtraction angle identity

= sin(360)cos(60) - cos(360)sin(60)

= -√(3) / 2

Michael J.

I don't know why your teacher said you have to continue. -√(3)/2 is the most simplest solution to this.

Report

06/16/15

Andrew M.

I agree with Michael. The only possible other thing you could do at that point would be to work it out to a decimal which is not necessary. You really need to ask your teacher to explain the reasoning and show you what else he/she wants done.

Report

06/16/15

Ask a question for free

Get a free answer to a quick problem.

Most questions answered within 4 hours.

Find an Online Tutor Now

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.

Garen T.

06/16/15