Question

if sin 780 sin 480 - cos 12o sin 330 =k then K is​

Answer 1

Answer:

K=1. Explained in the image

Step-by-step explanation:

Hope it help you

Answer 2

Answer:

(3)1/2

Step-by-step explanation:

sin780=sin(360.2+60)=sin60=√3/2

sin480=sin(360.1+120)=sin120=sin(90.1+30)=cos30=√3/2

cos120=cos(90.1+30)= -sin30=-1/2

sin330=sin(360.1-30)=-sin30=-1/2

sin780.sin480-cos120.sin330=k

√3/2.(√3/2)-(-1/2)(-1/2)=k

3/4-1/4=k

2/4=k

k=1/2