8KiB, 284x178, portal one cake.jpg View SameGoogleiqdbSauceNAO math Anonymous Wed 08 Apr 01:05:18 2020 No.11543300 ViewReplyOriginalReport Quoted By: >>11543371 >>11543491 Write the product as a sum. cos 7x cos 5x anyone know how to do this? this quarantine is fucking me up