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October 21, 2025, 09:06:52 pm
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Author Topic: in terms of sin(x)  (Read 772 times)  Share 

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TrueTears

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in terms of sin(x)
« on: December 24, 2008, 08:55:32 pm »
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1. expand sin(x+2x) = sin(x)cos(2x)+sin(2x)cos(x)

2. hence express sin(3x) in terms of sin(x). Just a bit confused over this one o.O
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Mao

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Re: in terms of sin(x)
« Reply #1 on: December 24, 2008, 09:03:34 pm »
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expand cos 2x and sin 2x, then try to make all the cos^2 into sin^2 =]
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TrueTears

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Re: in terms of sin(x)
« Reply #2 on: December 24, 2008, 10:10:02 pm »
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ahhh thanks mao yet again :)
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