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1. Hi, I have a pre-calculus final tomorrow, and there are a few questions I don't understand.
I'd truly appreciate it if you could help :)
1. If sin(theta)=1/4, theta in quadrant II, find the exact value of cos(theta+pi/6)
2. sin(sin^-1(2/3) + cos^-1(1/3)) -- simplify
3. cos(5pi/18)sin(pi/9) - cos(pi/9)sin(5pi/18) -- simplify
2. n/a
3.
1. if sin theta = 1/4, that would mean the sides are 1, 4, root15. Use coscos-sinsin (composite argument) and plug into make [(root 15)/4 * root3/2 ] - [1/4 * 1/2] then...?
2. I'm truly confused about this one... do you use the calculator to find the individual inverse sine/cosine functions? then add the two, and use the sin function on them? If so, do you use the graphing calculator?
3. this is the sine composite function (subtracting), I know that, but I do not know how to continue on...
I am so bad at these, and I'm freaking out for my final... :(
Thank you!
I'd truly appreciate it if you could help :)
1. If sin(theta)=1/4, theta in quadrant II, find the exact value of cos(theta+pi/6)
2. sin(sin^-1(2/3) + cos^-1(1/3)) -- simplify
3. cos(5pi/18)sin(pi/9) - cos(pi/9)sin(5pi/18) -- simplify
2. n/a
3.
1. if sin theta = 1/4, that would mean the sides are 1, 4, root15. Use coscos-sinsin (composite argument) and plug into make [(root 15)/4 * root3/2 ] - [1/4 * 1/2] then...?
2. I'm truly confused about this one... do you use the calculator to find the individual inverse sine/cosine functions? then add the two, and use the sin function on them? If so, do you use the graphing calculator?
3. this is the sine composite function (subtracting), I know that, but I do not know how to continue on...
I am so bad at these, and I'm freaking out for my final... :(
Thank you!