Finding solution to sin of arcsin  TOPIC_SOLVED

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Finding solution to sin of arcsin

Postby andrew05 on Tue Apr 16, 2013 10:18 am

An expression on my homework I just CAN'T figure out is sin(arccos (x/2)+(pi/3))

I'm not sure if I should do the arccos of both x/2 and pi/3...or if I should do the arccos of x/2, add pi/3, then take the sin of that. I've tried both ways and get answers that make sense either way.
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Re: Finding solution to sin of arcsin  TOPIC_SOLVED

Postby theshadow on Tue Apr 16, 2013 12:55 pm

andrew05 wrote:An expression on my homework I just CAN'T figure out is sin(arccos (x/2)+(pi/3))

i'd do the angle sum formula for sines & then do the parts separately:

sin(arccos(x/2))cos(pi/3) + cos(arccos(x/2))sin(pi/3)
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