Engineering Board Exam Reviewer · Trigonometric Identities · medium

Simplify: - ≤ft( ) + ≤ft( )1 - ≤ft( )

  1. ≤ft( )
  2. ≤ft( ) ≤ft( )
  3. 1 ≤ft( ) + ≤ft( )
  4. ≤ft( )

Answer

D. ≤ft( )

Solution

/1- = (1+ )/ 2 =1+ / . Subtracting = / leaves 1/ = .

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