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6.23.18 Rewriting tan(x) in terms of cos(2x) and sin(2x): tan2cossin2

The tan2cossin2 command replaces tan(x) by 1−cos(2x)/sin(2x) in an expression.


Example.
Input:

tan2cossin2(tan(x))

Output:

1−cos
2 x
sin
2 x

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