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Cot180/18×cot180/9×cot180/4×cot4×180/18×Cot7×180/18=???????????????????????????????????????????????????????????????????????????????

Cot180/18×cot180/9×cot180/4×cot4×180/18×Cot7×180/18=???????????????????????????????????????????????????????????????????????????????

Grade:10

1 Answers

Aditya Gupta
2081 Points
5 years ago
Cot180/18×cot180/9×cot180/4×cot4×180/18×Cot7×180/18=Cot10×cot20×cot45×cot40×Cot70
now cot45=1 nd cot20*cot70=cot20*tan70=cot20/cot20=1
so it becomes cot10*cot40.
note that it cannot be simplified further into a closed form

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