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Grade: 12th pass

                        

The simplest value of cot9 cot27 cot63 cot81 is- (1) 0 (2) 1 (3) -1 (4) (3)^1/2

4 years ago

Answers : (1)

Harsh Patodia
IIT Roorkee
askIITians Faculty
907 Points
							
cot9 = tan (90-9) =tan81
tan81 cot81 =1
similarly cot27cot63=1
Simplest value will be 1.
4 years ago
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