Question

if tan35°=a, then tan 215°+ cot145° is:-​

Answer 1

Answer:

(a²-1)/a

Step-by-step explanation:

tan215° + cot145°,

= tan(180°+35) + cot(180-35),

= tan35° - cot35°,

= tan35° - 1/tan35°,

= tan²35°-1/tan35°

=(a²-1)/a