Question

Tan9.tan27.tan45.tan63.tan81=1

Answer 1

tan9.tan27.tan45.tan63.tan81 

tan(90 - 81).tan(90 - 63).1.tan63.tan81

cot81.cot63.tan63.tan81

-------------------
We know, 

cot =1/tan
-----------------

then,

1/tan81 . 1/tan63 . tan63 . tan81 

1.1

1 


hence, it is equal to 1 



i hope this will help you


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Answer 2

Step-by-step explanation:

simplify sin(-thita)tan(180+thita)tan(90+thita)÷cot(90-thita)cos(360-thita)sin(180-thita)