Question

acosA + bsinA =m , asinA -bcosA =n prove that m^-n^=a^-b^

Answer 1

Answer:

m^2-n^2

=(acosA+bsinA)^2-(asinA-bcosA)^2

=(acosA)^2+(bsinA)^2+2absinAcosA-(asinA)^2-(bcosA)^2+2absinAcosA.

=