Question

If sin Ѳ + cosѲ =3 then find the value of sinѲ x cosѲ

Answer 1

(sin@+cos@)^2 =sin^2@+cos^2@[email protected]@

sin^2@+cos^2@=1

3^2=1+2sin@cos@

9-1=2sin@cos@

8/2 =sin@cos@

4 is right answer