Question

find the value of tan 2A, if cos 3A =sin 45.

Answer 1

Hey

Solution

==>Cos3A = sin 45

==>Sin ( 90 - 3A ) = sin 45

==>90 - 3A = 45

==>45 = 3A

==>A = 15


So, tan2A = tan 2x 15 = tan30 = 1 /√3h..

Thanks