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Question

I f blank x comma blank y comma blank z blank a r e blank i n blank A. P comma blank t h e n fraction numerator sin invisible function application x minus sin invisible function application z over denominator cos invisible function application z minus cos invisible function application x end fraction blank i s blank e q u a l blank t o

  1. tan invisible function application y  
  2. cot invisible function application y  
  3. sin invisible function application y  
  4. cos invisible function application y  

The correct answer is: cot invisible function application y


    fraction numerator sin invisible function application x minus sin invisible function application z over denominator cos invisible function application z minus cos invisible function application x end fraction equals fraction numerator 2 cos invisible function application open parentheses fraction numerator x plus z over denominator 2 end fraction close parentheses sin invisible function application open parentheses fraction numerator x minus z over denominator z end fraction close parentheses over denominator 2 sin invisible function application open parentheses fraction numerator x plus z over denominator z end fraction close parentheses sin invisible function application open parentheses fraction numerator x minus z over denominator z end fraction close parentheses end fraction equals cot invisible function application open parentheses fraction numerator x plus z over denominator 2 end fraction close parentheses equals cot invisible function application open parentheses y close parentheses

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