In the acute angle triangle ABC, a, B and C are the opposite sides of the inner angles a, B and C respectively, and satisfy √ 3A = 2bsin A. (1) find the value of tanb; (2) if a + C and B = √ 7, find the area of triangle ABC

In the acute angle triangle ABC, a, B and C are the opposite sides of the inner angles a, B and C respectively, and satisfy √ 3A = 2bsin A. (1) find the value of tanb; (2) if a + C and B = √ 7, find the area of triangle ABC

According to the sine theorem √ 3sina-2sinbsina = 0 ∵ A is the inner angle of a triangle ∵ Sina > 0 ∵ SINB = √ 3 / 2 ∵ in an acute triangle ∵ B = π / 3 ∵ tanb = √ 3 (2) by the cosine theorem B & # 178; = A & # 178; + C & # 178; - 2accosb, that is, a & # 1