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Outcome 3 unit 2 ~ Help please

castlehead

Posted 27 November 2011 - 02:46 PM

Would appreciate help on solving questions like this:

Write down the formula for cos(C+D)

Use the triangles to show that cos(C+D) = ...

Thanks.

andrew6395

Posted 12 December 2011 - 10:37 PM

You would use the trig formula,
cos(C+D)=cosCcosD-sinCsinD and sub in the values of C and D then just solve it by finding the (cosC [^x] cosD) - (sinC [^x] sinD)

Hope that helps,
Andrew M

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