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sara1234 Group TitleBest ResponseYou've already chosen the best response.0
@jim_thompson5910 @Nameless
 one year ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.1
sin(3x) = sin(2x + x) sin(3x) = sin(2x)cos(x) + cos(2x)sin(x) sin(3x) = sin(x+x)cos(x) + cos(x+x)sin(x) sin(3x) = [sin(x)cos(x) + cos(x)sin(x)]cos(x) + [cos(x)cos(x)  sin(x)sin(x)]sin(x) sin(3x) = [2cos(x)sin(x)]cos(x) + [cos^2(x)  sin^2(x)]sin(x) sin(3x) = 2cos^2(x)sin(x) + cos^2(x)sin(x)  sin^3(x) Do the same to find cos(3x)
 one year ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.1
I'm using the identities sin(x+y) = sin(x)cos(y) + cos(x)sin(y) cos(x+y) = cos(x)cos(y)  sin(x)sin(y)
 one year ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.1
sry i should have gone further sin(3x) = 3cos^2(x)sin(x)  sin^3(x)
 one year ago

sara1234 Group TitleBest ResponseYou've already chosen the best response.0
im confused can you tell me what the answer is so i can check if i got it right?
 one year ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.1
hold on one sec
 one year ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.1
checking the answer, but the second one doesn't seem right, but one sec
 one year ago

sara1234 Group TitleBest ResponseYou've already chosen the best response.0
ok thank you
 one year ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.1
well using a graphing calculator, I was able to eliminate choices A through C so that leaves D
 one year ago
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