What property this does this equation come under ( int^1_{-1} )sin x

1.	What property this does this equation come under ( int^1_{-1} )sin x dx=- ( int_1^{-1} )sin x dx?
A.	Reverse integral property
B.	Adding intervals property
C.	Zero-length interval property
D.	Adding integrand property
Answer» B. Adding intervals property

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