In a , and is a solution of the equation . Then…

MATHEMATICS · Single correct · A Level · Mathematics · Trigonometry · Trigonometry

Problem

In a

\triangle ABC

2\cos A=\frac{\sin B}{\sin C}

and

2^{\tan^2B}

is a solution of the equation

x^2-9x+8=0

. Then

\triangle ABC

is (1) equilateral (2) isosceles (3) scalene (4) right-angled