Solution: What is (cos A)^4 – (sin A)^4 equal to?

(cos A)^4 – (sin A)^4 is equal to ______. How to solve problems using double angle formulas?

(cos A)^4 – (sin A)^4 is equal to ______.

Problem Statement: ECE Board April 1999

(cos A)^4 – (sin A)^4 is equal to ______.
  • A. cos 4A
  • B. cos 2A
  • C. sin 2A
  • D. sin 4A

Problem Answer:

(cos A)^4 – (sin A)^4 is equal to cos 2A.


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