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5.24.14  Transform complex exponentials into sin and cos: sincos exp2trig

sincos or exp2trig takes as argument an expression containing complex exponentials.
sincos or exp2trig rewrites this expression in terms of sin and cos.
Input:

sincos(exp(i*x))

Output:

cos(x)+(i)*sin(x)

Input:

exp2trig(exp(-i*x))

Output:

cos(x)+(i)*(-(sin(x)))

Input:

simplify(sincos(((i)*(exp((i)*x))^2-i)/(2*exp((i)*x))))

or:

simplify(exp2trig(((i)*(exp((i)*x))^2-i)/(2*exp((i)*x))))

Output:

-sin(x)

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