Question

find the value of tan2A if cos3A =sin45°

Answer 1

Cos 3A = sin45

so, Cos 3A = sin (90-45)
      Cos 3A = Cos45

   so, 3A = 45
    so, A = 15°

So, tan 2A = tan 2*15 = tan30° = 1/√3

Answer 2

here is the ans........