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WOLFRAM|DEMONSTRATIONS PROJECT

A Sine/Cosine Identity

​
A
0.2
B
0.7
B=A
This Demonstration looks at the trigonometric identity
sin(2θ)=2sin(θ)cos(θ)
. We plot the functions
sin(Ax)
(red curves),
cos(Bx)
(orange curves), and compare the plots of the functions
2sin(Ax)cos(Bx)
(black, on the left) and
sin((A+B)x)
(black, on the right); when
A=B
, they are the same.
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