Hi Everbody lost my basic maths books was wondering how to

convert cosx-sinx into a single sine function

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- Jul 28th 2008, 01:20 PMhoops2008cosx-sinx
Hi Everbody lost my basic maths books was wondering how to

convert cosx-sinx into a single sine function - Jul 28th 2008, 02:41 PMTwistedOne151Sum to product identity
You can use one of the sum-to-product identities.

For example,

use

along with

To get

Or, using ,

.

--Kevin C. - Jul 28th 2008, 07:38 PMSoroban
Hello, hoops2008!

Another approach . . .

Quote:

Convert into a single sine function

Note that: .

So we have: .

- Jul 29th 2008, 01:26 PMhoops2008
Thanks for the replys fellas. I loved doing this kind of maths a long time ago and i am now very rusty.

Could someone please verify that

root2*415cos(100piet)-root2*415sin(100piet)=2*root830sin(wt- Pie/2)

i couldnt get the maths symbols to copy over hence why i had the write "pie" and "root".

this was the original question that my nephew asked me.

Id be very greatful for some help here

Thanks guys