Question

prove that cot 48 cot 33 cot 42 cot 57=1

Answer 1

Answer:

Step-by-step explanation:

cot48 cot33 cot 42 cot 57=1

tan90-33 tan 90-57=1

Answer 2

cot48 cot42 cot33 cot57.
cot48 cot(90-42) cot33 cot(90-57)
cot48.tan48.cot33.tan33
1.1= 1
Hence proved