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anonymous

  • 5 years ago

I need some help with questions 5-10 http://locker.palcs.org/~jbaskwill/pc/5-3practice.PDF

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  1. anonymous
    • 5 years ago
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    It has to do with Sum and Difference Identities in Pre-Calc

  2. anonymous
    • 5 years ago
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    no 5 -> we know that cosx cosy+sinx siny = cos(x-y) therefore cos133 cos58+ sin133 sin58 = cos(133-58) = cos75 the answer is B

  3. anonymous
    • 5 years ago
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    6) sinx cosy +cosx siny = sin(x+y) sin(π/5) cos(π/11) +sin(π/11) cos(π/5) = sin(π/5 + π/11) = sin(16π/55) answer : D

  4. anonymous
    • 5 years ago
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    7) (tanx - tany)/(1+tanx tany) = tan(x-y) so the answer is tan 48

  5. anonymous
    • 5 years ago
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    thank you soo much. you helped a lot!

  6. anonymous
    • 5 years ago
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    you're welcome, sorry i can't help for number 8-10

  7. anonymous
    • 5 years ago
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    its ok

  8. dumbcow
    • 5 years ago
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    i can help with 9 and 10, you need to use the sum and difference formulas 9) Notice its a sin function because it crosses the x-axis around x=2 meaning the sin function has been shifted to the right 2 units. Now use y = sin(x+(-2)) = sin(x)cos(-2) +cos(x)sin(-2) 10) This one is a cosine function because at x=3 it starts a new period at 1 so the cosine function has been shifted right 3 units. So y = cos(x+(-3)) = cos(x)cos(-3) - sin(x)sin(-3)

  9. anonymous
    • 5 years ago
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    thank you

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