Posted by k on Sunday, December 18, 2011 at 11:20pm.
just drag out your good old trig identities:
sin^2 a + cos^2 a = 1
You have a 3-4-5 and a 8-15-17 triangle.
You could figure that out using the formula above.
Next:
sin(u+v) = sinu cosv + cosu sinv
sin(u+v) = 3/5 * 8/17 + 4/5 * 15/17
and I guess you can take it from there . . .
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