Question

tan 10°+tan 15°+tan 75°+tan 80° = 1

Lesson : Complementary Angles
Trigonometrical Ratios​

Answer 1

Step-by-step explanation:

tan 10°+ tan 15°+ tan 75°+ tan 80° = 1

tan (90-x)° = cot x°

tan 10°+ cot 10° +cot 15° + tan 15° = 1