Engineering Board Exam Reviewer · Trigonometric Identities · medium

If A= 45 and B=5/13, with A and B both in Quadrant I, find (A-B).

  1. 56/65
  2. - 33/65
  3. 16/65
  4. 63/65

Answer

D. 63/65

Solution

A= 35 and B=12/13. (A-B)= A B+ A B= 35· 513+ 45·12/13=15+48/65=63/65.

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