Question

evaluate this .........​

Answer 1

tan1 ×cot (90-89) ×tan2×cot(90-88).......so on continue

=tan1×1/tan1 tan2×1/tan2.............reciprocals continued...

=1×1×1.....

=1

Answer 2

Answer:

tan1°.tan2°tan3°......... tan89°=

tan(90-89). tan(90-88). tan(90-78)........ tan89

cot89. cot88. cot87.......... tan89

cot89×tan89.cot88×tan88..... =1

proved.