(a) If the vectors

→

a

and

→

b

are such that |

→

a

|=3,|

→

b

|=‌

2

3

and

→

a

×

→

b

is a unit vector, then find the angle between

→

a

and

→

b

.
OR
(b) Find the area of a parallelogram whose adjacent sides are determined by the vectors

→

a

=

^

i

−

^

j

+3

^

k

and

→

b

=2

^

i

−7

^

j

+

^

k

.