Question

Cot 9cot 27 cot45cot 63 cot81=1

Answer 1

Step-by-step explanation:

cot9×cot81×cot27×cot63×cot45=1

cot9×tan(90-9)×cot27×tan(90-27) cot45=1

cot9×1/cot9×cot27×1/cot27×cot45=1(cot9 se 1cot9 cut gya & cot 27 se 1/27 cot bhi cut gya )

now cot45=1

1=1 (cot45 =1)

Answer 2

Answer:

i hope you understand...