Question

Find : 2 tan 15 tan 37 tan 53 tan 60 tan 79

Answer 1

it should be tan 75 not 79

2tan 15 x tan 37 x tan53 x tan 60 x tan 75
2tan 15 x cot(90-75) x tan 37  x cot(90-53) x under root 3
2tan 15 x cot 15 x tan 37 x  cot 37 x under root 3
2tan 15 x 1\tan15 x tan37 x 1/tan 37  x under root 3
after cancellation answer 
= 2root 3
 
hope it helps you:)!!