Question

Cos11•+sin11•/cos11•-sin11

Answer 1

 (cos11 + sin11) / (cos11 - sin11)
= { (cos11 + sin11) / cos11} / { (cos11 - sin11) / cos11 } 
= { 1 + (sin11 / cos11) } / { 1 - (sin11 / cos11) } 
= (1 + tan11) / (1 - tan11) [ tan 45 = 1 ] 
= (1 + tan11) / (1 - tan11) [ tan 45 = 1 ] 
=tan 56 = tan(45 + 11) 
      



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Answer 2

Answer is attached to the file

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