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Trig help - HSN forum

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Trig help


3 replies to this topic

#1 John

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Posted 13 October 2006 - 06:53 PM

I've been asked this question in my uni homework and not sure how to expand it.

Expand sin(A + B + C) in terms of sin A, sin B, sin C, cos A, cos B, cos C.

How would i tackle this?

They also ask the same for cos(A + B + C)


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#2 The Wedge Effect

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Posted 13 October 2006 - 10:23 PM

I'd think you just expand it like sin(A+(B+C))=sinAcos(B+C)+cosAsin(B+C) then expand again to get sinA (cosB cosC - sinB sinC)+cosA (sinB cosC + sinC cosB)...

#3 broughy

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Posted 13 October 2006 - 10:28 PM

i'm with him.

but whether or not you want to take mathematical advice off me is another matter....
when i'm dancin' with you,
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turn that music up,
till the windows start to shatter,
cos you're the only one who can get me on my feet,
& i can't even dance

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#4 Dave

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Posted 14 October 2006 - 01:04 AM

yeh that is how he did it- i gave him help dont you know ohmy.gif which is shocking to me i must say. I think he just made a mistake in the expanding cos he had the right method

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