2016 · Q23
((sin 35°)/(cos 55°))²-((cos 55°)/(sin 35°))²+2sin 30° is equal to
Elementary MathematicsTrigonometry
- A-1
- B0
- C1
- D2
Explanation
Since cos 55° = sin 35°, each fraction equals 1. Substituting, the expression becomes 1²−1²+2·(1/2). This equals 1, option C.