Question

Evalute cot.12 38.cot 52.cot 60.cot 78​

Answer 1

Answer:

1/√3

Step-by-step explanation:

we know

cot(90-X)=tanX

so, cot12=tan78

cot38=tan52

The question becomes

tan78*cot78*tan52*cot*52*cot60

Now, tanX*cotX=1, so,

the question simplifies to cot60

now cot60=1/√3