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jchibu · Nov 30, 2009, 10:07 PM

I've been having a really tough time in this course and the current unit we are covering is completely going over my head.

Chapter 7: Trigonometric Identities and Equations

I'm not understanding how to do it at all for the most part.

One of the questions says:

Use the appropriate compound angle formula to determine the exact value of each expression.

sin(π + π )
---)
6 )

jchibu · Nov 30, 2009, 10:08 PM

sin(π + π/6 ), π = pi

Unknown008 · Dec 1, 2009, 04:22 AM

Well, to start, you need to know your identities.

$sin(A+B) = sinAcosB + cosAsinB$

Then, you'll need to know your trig basics.

$sin(\pi) = 0$ , $cos(0) = 1$

and

$sin(\frac{\pi}{6}) = \frac12$ , $cos(\frac{\pi}{6}) = \frac{\sqrt3}{2}$

Try it out, and tell what you come up with :)

jchibu · Dec 2, 2009, 04:56 PM

Thanks, it worked out nicely :)