Question

Use trigonometric identities to transform the left side of the equation to the right side

Answer 1

$tan\theta=\frac{sin\theta}{cos\theta}\\\\cot\theta=\frac{cos\theta}{sin\theta}\\\\tan\theta cot\theta=1\\\\L=\frac{sin\theta}{cos\theta}\times\frac{cos\theta}{sin\theta}=\frac{sin\theta cos\theta}{sin\theta cos\theta}=1=R$

Answer 2

Tan = sin/cos

Cot = cos/sin

(tan) x (cot) = (sin/cos) x (cos/sin) = 1