This is a wish list of easy changes in Trigonometric Simplification to SINE function but they could be extended to other functions as well.
1) The trigonometric simplification should be aware that SIN(3*%PI/7)=SIN(4*%PI/7) or in general SIN(%PI* a/c)=SIN(%PI *b/c) where a+b=c. (a,b,c > 0)
2) The trigonometric simplification should simplify SIN(%PI*494/7) to SIN(%PI*(70+4))=SIN(%PI*4/7)
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