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[" 16.cot "16^(@)cot44^(@)+cot44^(@)cot7...

[" 16.cot "16^(@)cot44^(@)+cot44^(@)cot76^(@)-cot76^(@)cot16^(@)=],[[" a) "0," b) "1," c) "3," d) "4]]

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cot16^(0)cot44^(0)+cot44^(0)cot76^(0)-cot76^(0)cot16^(0)

cot 16^(@) cot 44^(@) + cot 44^(@) cot 76^(@) - cot 76^(@) cot 16^(@)=

Show that: cot16^(@)*cot44^(@)+cot44^(@)*cot76^(@)-cot76^(@)*cot16^(@)=3

cot10^(@)cot20^(@)cot60^(@)cot70^(@)cot80^(@)=

cot12^(@)cot102^(@)+cot102^(@)cot66^(@)+cot66^(@)cot12^(@) =

Show that, cot16^(@) cot44^(@) + cot44^(@) cot76^(@) + cot76^(@) cot 16^(@) = 3

cot16^(0)cot44^(0)+cot44^(0)cot76^(0)-cot76^(0)cot16^(0)=(a)1(b)2(c)3(d)4

tan46^(@)-cot44^(@)=?