Problem:

Determine the exact value of each trigonometric ratio.

I know that i have to use either: OR

I'm stuck after that. Please help me.(Crying)

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- Dec 11th 2008, 01:34 PMMorphayneCompound Angle Identities
__Problem:__

Determine the exact value of each trigonometric ratio.

I know that i have to use either: OR

I'm stuck after that. Please help me.(Crying) - Dec 11th 2008, 01:51 PMnzmathman
First find

using the expansion for

because 1/3 - 1/4 = 1/12.

Now find by expanding

- Dec 11th 2008, 01:53 PMskeeter
hint ...

last two values are on the unit circle ...

- Dec 11th 2008, 02:10 PMSoroban
Hello, Morphayne!

Quote:

Determine the exact value of: .

Now we must express as the sum of two "familiar" angles.

Make a list . . .

. .

So we have: .

. . . . . . . . . . . . . . .

Multiply by

Multiply by

. .

- Dec 11th 2008, 02:11 PMchabmgph