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ANOTHER homework question - HSN forum

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ANOTHER homework question


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#1 craig1e

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Posted 09 January 2007 - 08:26 PM

Show that cos(pi/2 + x) = -sinx

Can anyone Help?

#2 Nathan

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Posted 09 January 2007 - 09:10 PM

cos(pi.gif/2 + x) = cos[pi]/2.cosx - sin[pi]/2.sinx
=0.cosx - 1.sinx
=sinx

(This is just taking advantage of the fact that cos(a+b) = cosacosb - sinasinb wink.gif )

#3 craig1e

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Posted 09 January 2007 - 09:27 PM

cheers mate. All so simple now biggrin.gif





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