Question

28.
tan 6° tan 42° tan 66° tan 78° = 1
by solving and we have to substitute the value by that way I need answer​

Answer 1

Answer:

$\boxed{\red{\bf \green{\dag} Solution }}$

Step-by-step explanation:

=tan 6° tan 42° tan 66° tan 78°

See the 4 attachment......