Engineering Board Exam Reviewer · Trigonometric Equations · medium

EE Board April 1992: Find the value of A between 270° and 360° if 2 2 A - A = 1.

1. 300°
2. 320°
3. 310°
4. 330°

Answer

D. 330°

Solution

2 2A- A-1=0 (2 A+1)( A-1)=0. So A=- 12 or A=1. Between 270° and 360°, A=- 12 gives A=330°.

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