Question

Prove that Tan 10⁰ + tan 20⁰, tan 70⁰ + tan 80⁰ = 0

Answer 1

Answer:

2

Step-by-step explanation:

left side:

tan10°+ tan20° +tan70°+ tan80°

tan10°+tan80°+tan20°+tan70°

cot(90°-10°)+tan80°+cot(90°-20°)+tan70°

cot80+tan80 + cot70+tan70

1+1=2

because tan and cot is opposite to each other...