Question

Cosec² 72º - tan² 18º = 1​

Answer 1

Answer:

do you have a pic of the old one and

Step-by-step explanation:

FG or call me at your convenience and

Answer 2

$LHS \\ {cosec}^{2} 72 - { tan }^{2} 18 \\ = > \frac{1}{ {sin}^{2} 72} - {cot}^{2} 72 \\ = > \frac{1}{ {sin}^{2} 72} - \frac{ {cos}^{2} 72}{ {sin}^{2} 72} \\ = > \frac{1 - {cos}^{2} 72}{ {sin}^{2}72 } \\ = > \frac{ {sin}^{2} 72}{ {sin}^{2}72 } \\ = > 1 = RHS = 1$