Question

please answer the question

Answer 1

Answer:

Step-by-step explanation:

Square and add both the equations we get

a^2 cos^2(Q)+b^2 sin^2(Q)+2abcos(Q)sin(Q)+a^2 sin^2(Q)+b^2 cos^2(Q)-2abcos(Q)sin(Q)=m^2+n^2

Thus we get

a^2 +b^2=m^2+n^2

Answer 2

Hope you understood the solution