How would I find the exact value of sin(pie/16) using trig identities?

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- Apr 29th 2009, 11:30 AMzweevuExact values using trig identities
How would I find the exact value of sin(pie/16) using trig identities?

- Apr 29th 2009, 12:04 PMTheEmptySet
You will need the the identities

Note that

and

I hope this helps - Apr 29th 2009, 12:18 PMSoroban
Hello, zweevu!

We need two Double angle identities:

. .

. .

Quote:

Find the exact value of using trig identities.

. . .

. . . .

And I'll letsimplify it . . .*you*

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

Well, okay . . . I got: .

- Apr 29th 2009, 04:27 PMzweevu
Well that was simple. Thanks!