Question

prove that :(1+cot A)² + (1-cot A)² = 2 cosec² A​

Answer 1

Answer:

proved

Step-by-step explanation:

$LHS=1+2cotA+cot^{2} A+1-2cotA+cot^{2} A\\=2+2cot^{2} A\\=2(1+cot^{2} A)\\=2cosec^{2} A$