I have an output that consists of more than 4000 lines where each line is a constant times a product of circular functions, each having only a single argument. Repeatedly the same product of circular functions is multiplied by several constants on separate lines. I want each distinct product of circular functions to appear only once multiplied by the sum of the contants that mulitplied it separately.   Simplify[ ] combines the circular function products into circular functions with arguments that are sums of the original arguments, which I do not want to happen, and it did not group the contants into  single factors. FullSimplify[ ] appears to be overkill.  It ran for a week with no result, so I aborted it.  It seems there must be a way to convert the ouput to a sum of products of the circular functions with single arguments where each product appears only once with a sum constants multiplying it while not combining the products into circular functions with arguments that are combinations of the single arguments.