Question

if √3 cotA=3 then find the value of cos2A?​

Answer 1

Answer:

√3 cot A =3

cot A = √3

tan A = 1/√3

thus, A = 30° (As tan 30°= 1/√3)

thus, cos 2A = cos (2*30)

cos 60°

= 1/2