Question

IF tan a × tan 2a = 1 , then find the value sin a + sin 2a

Answer 1

tan2a= 2tana/1-tan^2a

3tan^a=1

Tana=1/√3
a=30 degree
so value of sin30 + sin60= (1+√3)/2

Answer 2

IF tan a × tan 2a = 1 , then find the value sin a + sin 2a

solution:

tan2a= 2tana/1-tan^2a

3tan^a=1

Tana=1/√3

a=30 degree

so value of sin30 + sin60= (1+√3)/2