Question

2
COS 45 cos 60 -sin 45 sin 60​

Answer 1

Answer:

cos 45 cos 60-sin 45 sin 60

=1/√2.1/2-1/√2.√3/2

=1/2√2-√3/2√2

=(1-√3)/2√2

Answer 2

Answer:

-(√3−1)/(2√2)

Step-by-step explanation:

COS 45 cos 60 -sin 45 sin 60​

=cos(60+45)

=cos(90+15)

angle is in II quadrant so cos is -ve

= -sin 15

= -(√3−1)/(2√2)