Question

if F(f(x))=F(y) then prove that F(f(x)cosax)=(F(y+a)+F(y-a))/2

Answer 1

carrying descriptively

Answer 2

Answer:

Plaster of paris, quick-setting gypsum plaster consisting of a fine white powder (calcium sulfate hemihydrate), which hardens when moistened and allowed to dry. Known since ancient times, plaster of paris is so called because of its preparation from the abundant gypsum found near Paris.