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sara1234Best ResponseYou've already chosen the best response.0
@jim_thompson5910 @Nameless
 one year ago

jim_thompson5910Best 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_thompson5910Best 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_thompson5910Best 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

sara1234Best 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_thompson5910Best ResponseYou've already chosen the best response.1
hold on one sec
 one year ago

jim_thompson5910Best 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

jim_thompson5910Best 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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