Question

for 0<A<90 then tan A + tan2A + tan 3A =0 if
(A) tan A=0
(B) tan 2A=0
(C) tan 3A =0
(D) tan A * tan 2A =2​

Answer 1

if A=45degree tan2A=0

tanA+tan2A+tan3A=0

tan45degree= 1/root2

tan3(45degree)= 3pai/4

3pai/4 is 2end quadrant,so it is

nagtive(-ve)