If cos A+cos2 A = 1, then sin2 A+sin4 A is equal to ;
Answer : Option B
Explanation : cos A = 1 – cos2 A = sin2 A
∴ sin² A + sin⁴A = cosA + cos²A = 1
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If cos A+cos2 A = 1, then sin2 A+sin4 A is equal to ;
cos A = 1 – cos2 A = sin2 A
∴ sin² A + sin⁴A = cosA + cos²A = 1