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Dev2.0

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  • 1. 1 Given the following:  Find  . Where both angles are in the fourth quadrant.
  • 2. 2 First we need to find  and We know that we are given So we need to solve for the hypotenuse side.
  • 3. 3 Now that we have the hypotenuse  side, we now know that:
  • 4. 4 Now we need to find  and We know that we are given So we just need to solve for the hypotenuse.
  • 5. 5 After knowing what the hypotenuse side is ,  we can now safely say that:
  • 6. 6 But before we substitute the values there is a  minor thing that we need to consider. It says  that both alpha and beta are in the fourth  quadrant , which means that both values of  sine will be negative.
  • 7. 7 Now we have all we need. We can just substitute it  in the formula.
  • 8. 8 Do some arithmetic then you will get the  same answer.