Solution: What is Sin (B – A) equal to, when B = 270 degrees and A is an acute angle.

Sin (B – A) is equal to _______, when B = 270 degrees and A is an acute angle. How to solve problems using difference of angles formulas?

Sin (B – A) is equal to _______, when B = 270 degrees and A is an acute angle.

Problem Statement: ECE Board April 1999

Sin (B – A) is equal to _______, when B = 270 degrees and A is an acute angle.
  • A. – cos A
  • B. cos A
  • C. – sin A
  • D. sin A

Problem Answer:

Sin (B – A) is equal to -cos A.

Solution:

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