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5.24.7  Simplify trigonometric expressions: trigsimplify

trigsimplify simplifies trigonometric expressions by combining simplify, texpand, tlin, tcollect, trigsin, trigcos and trigtan commands in a certain order.
Input:

trigsimplify((sin(x+y)-sin(x-y))/(cos(x+y)+cos(x-y)))

Output:

tan(y)

Input:

trigsimplify(1-1/4*sin(2a)^2-sin(b)^2-cos(a)^4)

Output:

sin(a)^2-sin(b)^2

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