Question

2cosπ/12cos5π/12=1/2​

Answer 1

LHS =

2 cos π * cos 5π

12 12

= 2 cos 15° * cos 75°

= 2 ( √3 + 1 ) ( √3 - 1 )

2√2 2√2

= 2 ( 2. )

8

=. 4

8

= 1

2

= RHS