Question

tan 39'tan 43'tan 47" tan 51 = ?
(a) 1
(b) 0
(0)
0
(d) 2​

Answer 1

Step-by-step explanation:

tan39=cot (90_51)=cot51..... (1)

tan43=cot 47. ...... (2)

substitute (1)and (2) we get

cot51.tan51.tan47.cot47=1

hence answer is 1