APFIVE Purpose of Trigonometric Sum Identities
In what way do the sum identities for sine and cosine exemplify the principle of decomposing complex trigonometric expressions into simpler components?
A
They prove that sine and cosine functions can be added directly without any transformation
B
They demonstrate that trigonometric functions are always simpler when expressed as sums
C
They express the sine or cosine of a sum of angles as a combination of sines and cosines of individual angles
D
They show that the sum of all trigonometric ratios is always equal to 1
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