sin square 42 - cos square 78
Answers
Answered by
8
Answered by
5
here your answer plz.
cos square 42-sin square 78
we have cos square A-sin square B=cos(A+B)cos(A-B)
using this we get.
LHS =-(cos 120cos36)
=cos 36/2
=(5 1/2+1)/8=Rhs.
I hope it is helpfull for you.
plz mark as brainliest.
cos square 42-sin square 78
we have cos square A-sin square B=cos(A+B)cos(A-B)
using this we get.
LHS =-(cos 120cos36)
=cos 36/2
=(5 1/2+1)/8=Rhs.
I hope it is helpfull for you.
plz mark as brainliest.
Similar questions