2014 · Q54
What is sin 25° sin 35° sec 65° sec 55° equal to?
Elementary MathematicsTrigonometry
- A-1
- B0
- C1/2
- D1
Explanation
sec 65° = cosec 25° and sec 55° = cosec 35°, so the product is 1.
What is sin 25° sin 35° sec 65° sec 55° equal to?
Explanation
sec 65° = cosec 25° and sec 55° = cosec 35°, so the product is 1.