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55,913 Posts

http://www.google.com/search?source...D:2003-51,GGLD:en&q=sin(pi+++x)+++sin(pi+-+x)

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6,956 Posts

All numbers in the above statement are estimated. Then again, you said simplify.

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1,717 Posts

Multiply it out to get

sin pi + sin x +sin pi - sin x

= 2 sin pi

sin pi + sin x +sin pi - sin x

= 2 sin pi

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6,956 Posts

whoops, yeah go with that

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597 Posts

sin(x-pi) = cos(x)

Can't remember what to do with sin(x+pi), but you can simplifiy it somehow. Anyway, you've probly learned it by now.

Oh i cant wait until i have to do this..

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1,333 Posts

sin(pi + x) + sin(pi - x)

sin(pi + x) = -sin(x)

sin(pi - x) = sin(x)

sin(pi + x) + sin(pi - x) = -sin(x) + sin(x) = 0

colman77,

You're thinking of: sin(pi/2-x) = cos(x)

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597 Posts

yes, I am! Oh well, it's not like my final is tomorrow or something. Oh, wait, it is. Crap.

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