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sara1234
 2 years ago
Best ResponseYou've already chosen the best response.0@jim_thompson5910 @Nameless

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.1sin(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)

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.1I'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)

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

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

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.1hold on one sec

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.1checking the answer, but the second one doesn't seem right, but one sec

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