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

Answer

C. 56/65

Solution

A= 35 and B=12/13. (A+B)= A B+ A B= 45· 513+ 35·12/13=20+36/65=56/65.

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