Mathematics Homework Solutions
Problem
#9007

Trigonometry: Addition Theorems

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Deduce the addition theorems for trigonometric functions:

cos (x ± y) = cosx cosy   sinx siny;

sin (x ± y) = sinx cosy ± cosx siny

as the simplest consequence of  the representation of  a complex plane’s rotational group.

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Teorems of addition (Problem).doc
Problem.

Deduce the addition theorems for trigonometric functions:

sinx siny;

sin (x ± y) = sinx cosy ± cosx siny

as the simplest consequence of the representation of complex plane’s
rotational group.

Solution Summary

Addition theorems for trigonometric functions are deduced.
The solution is detailed and well presented.

Solution
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Victor Apeltsine, PhD - 5/5
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