In △ ABC, a, B and C are the opposite sides of angles a, B and C respectively. Given that angle a is an acute angle and B = 3asinb, then Tana=______ .

In △ ABC, a, B and C are the opposite sides of angles a, B and C respectively. Given that angle a is an acute angle and B = 3asinb, then Tana=______ .

In △ ABC, angle a is an acute angle, and B = 3asinb. According to the sine theorem, SINB = 3sinasinb, ∵ Sina ≠ 0, so Sina = 13, ∵ cosa = 1 − sin2a = 223 & nbsp; Tana = sinacosa = 24, so the answer is 24