Question

Ei) tan 22°+tan 23°+tan 22° tan 23° = 1.​

Answer 1

Answer:

tan(22+23)=tan45

tan45=(tan22+tan23)/1-tan22tan23

From question

tan22+tan23=1-tan22tan23

1=(1-tan22tan23)/1-tan22tan23

=1

Hence proved