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StupidGenius
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Tennistar
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The person here explains it well

sara1234
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which answer is it though?

Tennistar
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um, now that you mention it, I don't see an answer. I'll go look for it

sara1234
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i saw those i cant seem to find the answer that matchs in the attactment

Tennistar
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@AccessDenied @Agent_Sniffles @evergirl @campbell_st @Libniz @LoveYou*69

Tennistar
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I don't know. I called some people to help, try to figure it out. Sorry and good luck!

sara1234
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can you guys help please?

trollpower
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sin(3x) = sin(x + 2x) =
sin(x)cos(2x) + cos(x)sin(2x)

sara1234
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@trollpower which answer is that?

trollpower
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your ques is sin(3x)+Cos(3x)

trollpower
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You just have to remember two formulas
sin(a+b) = sin(a)cos(b) + cos(a)sin(b)
cos(a+b) = cos(a)cos(b)  sin(a)sin(b)
Now solve it and get your answer

sara1234
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i don't know howw