allerySolve sin²A+cos A=1 for 0°≤A≤90°.
AAngle 0° only
BNo angle solutions
CAngle 90° only
DAngles 0° and 90°
Answer & Solution
Correct answer: D. Angles 0° and 90°
Substitution gives cos A(1 − cos A) = 0, allowing cosine zero or one at the two endpoints.
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