Angle is in Quadrant II and . What is ?
Answer and explanation
Correct answer: D.
- '' computes , neglecting the denominator .
- '' computes instead of .
- '' assumes is in Quadrant I where and , dropping the negative sign.
- '' computes instead of .
- '' assumes is in Quadrant I where and , dropping the negative sign.
- Step 1: Determine in Quadrant II where cosine is negative: .
- Step 2: Compute .
- Step 3: Apply the double-angle formula .
Answer
.
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