- Use sin(A-B)=cos(90-(A-B))=cos((90-A)+B) to derive formula for sin(A-B).?

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If a page of 90-page book is missing and the sum of remaining page numbers is 4012, what is the page number of the missing page? Are there such things as ghost rats/mice? Can someone help me with this question? I think the planes don't intersect.? How would cell function be affected if cell membranes were rigid and inflexible, like walls? Give two forms of evidence that the contour lines provide that help you determine the stream s flow.?