calculus bc multiple choice 2013 = -\sin t \), \( \frac{dy}{dt} = \cos t \). Find \( \frac{dy}{dx} = \frac{\frac{dy}{dt}}{\frac{dx}{dt}} = \frac{\cos t}{-\sin t} = -\cot t \). At \( t = \frac{\pi}{4} \): \( \cot \frac{\pi}{4} = 1 \). Therefore, \( \frac{dy}{dx} = -1 \). Answer: \( -1 \). Strategy: Use Mar 23, 2026 Read more →
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