Trig Ratios and Special Angles

Trigonometric ratios and functions, the unit circle, inverse trig functions, identities, trig graphs, etc.
Seaweed09
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Trig Ratios and Special Angles

Postby Seaweed09 » Wed Jan 25, 2012 11:55 pm

If sin x=-5/13, then determine sin(x/2). Should I use a compound angle formula for this?
Thanks!

FWT
Posts: 121
Joined: Sat Feb 28, 2009 8:53 pm

Re: Trig Ratios and Special Angles

Postby FWT » Thu Jan 26, 2012 9:57 pm

Seaweed09 wrote:If sin x=-5/13, then determine sin(x/2). Should I use a compound angle formula for this?
Thanks!

How about using the half-angle identity?


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