## Calculus 8th Edition

$sin\theta$ $cot\theta=cos\theta$
Need to prove $sin\theta$ $cot\theta=cos\theta$ Since, $cot\theta=\frac{cos\theta}{ sin\theta}$ (quotient property) Thus, $sin\theta cot\theta=sin\theta\times\frac{cos\theta}{ sin\theta}$ Hence, $sin\theta$ $cot\theta=cos\theta$