Appendix D - Trigonometry - D Exercises - Page A32: 45

$ 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$