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anonymous
 5 years ago
I need some help with questions 510
http://locker.palcs.org/~jbaskwill/pc/53practice.PDF
anonymous
 5 years ago
I need some help with questions 510 http://locker.palcs.org/~jbaskwill/pc/53practice.PDF

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0It has to do with Sum and Difference Identities in PreCalc

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0no 5 > we know that cosx cosy+sinx siny = cos(xy) therefore cos133 cos58+ sin133 sin58 = cos(13358) = cos75 the answer is B

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.06) 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

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.07) (tanx  tany)/(1+tanx tany) = tan(xy) so the answer is tan 48

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0thank you soo much. you helped a lot!

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0you're welcome, sorry i can't help for number 810

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0i 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 xaxis 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)
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