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Prove that `tan 70^(@)=cot70^(@)++2cot40^(@)`
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Prove that `tan 70^(@)=cot70^(@)++2cot40^(@)`
Prove that `tan 70^(@)=cot70^(@)++2cot40^(@)`
Prove that `tan70^(@)=cot70^(@)+2cot40^(@)`
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