2013 · Q46
If cos A + cos²A = 1, then what is 2(sin²A + sin^4A) equal to?
Elementary MathematicsTrigonometry
- A4
- B2
- C1
- D1/2
Explanation
cosA=sin²A; sin²+sin^4=cosA+cos²A=1 → 2×1=2. Answer B.
If cos A + cos²A = 1, then what is 2(sin²A + sin^4A) equal to?
Explanation
cosA=sin²A; sin²+sin^4=cosA+cos²A=1 → 2×1=2. Answer B.