I'm having a little trouble, here's the question:

If sin and cos , and and are positive acute angles, find

a.

b.

c.

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- Nov 3rd 2008, 03:40 PMeh501Sum and differences of angles?
I'm having a little trouble, here's the question:

If sin and cos , and and are positive acute angles, find

a.

b.

c. - Nov 3rd 2008, 04:17 PMJameson
First question - do you know the sum and difference formulas?

- Nov 3rd 2008, 04:48 PMeh501
Yeah.

- Nov 3rd 2008, 06:45 PMSoroban
Hello, eh501!

Okay, you know the three formulas:

. .

Quote:

If , and and are positive acute angles, find

. .

We can use: .

Since

. . . .

Then: .

. . Hence, we have: .

Use the same procedure on to find

. . then you can use those formulas . . .