- #26

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Thank you arildno I understand that now. It took a while but I got there in the end.

- Thread starter Maths dunce
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- #26

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Thank you arildno I understand that now. It took a while but I got there in the end.

- #27

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With a lot less work!Going the path along with the half angle product formula would have given you precisely the same expression.

- #28

ehild

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Yes, it is a lot less work if you remember that such formula exists.

The other method uses the basic addition laws of Trigonometry, taught and explained in detail in highschools.

You can also find the "ready" formulae for addition of two sinusoidal function of time, and it is also taught, why not use those? http://www.google.com/url?sa=t&rct=...=Vd_rop1AaDXfMkyVtL7PKA&bvm=bv.62922401,d.bGQ

ehild

The other method uses the basic addition laws of Trigonometry, taught and explained in detail in highschools.

You can also find the "ready" formulae for addition of two sinusoidal function of time, and it is also taught, why not use those? http://www.google.com/url?sa=t&rct=...=Vd_rop1AaDXfMkyVtL7PKA&bvm=bv.62922401,d.bGQ

ehild

Last edited:

- #29

arildno

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Thank you arildno I understand that now. It took a while but I got there in the end.

However, I would like to say that ehild's scheme, although apparently clunky, is a VERY important technique in many other fields as well, i.e, understanding and using the concept of linearly independent functions in order to solve particular problems.

It is, in a manner of speaking, a generally more powerful tool than trig identity tables that you'll gradually learn to appreciate.

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