Practice problem
Rewrite the product as a sum. cos(6u)+cos(4u)\\\cos(6u)+\cos(4u)cos(6u)+cos(4u)
2sin(5u)cos(u)2\sin(5u)\cos(u)2sin(5u)cos(u)
2sin(u)cos(5u)2\sin(u)\cos(5u)2sin(u)cos(5u)
2cos(5u)cos(u)2\cos(5u)\cos(u)2cos(5u)cos(u)
2sin(5u)sin(u)2\sin(5u)\sin(u)2sin(5u)sin(u)
Type a concept, like “slope” or “photosynthesis”.