Question

(Tana+cota)²-(tana-cota)²=4

Answer 1

Heya

L.H.S

Tan²a + Cot²a + 2 Tan a Cot a - Tan²a - Cot²a + 2tan a Cot a

=>

2Tan a Cot a + 2 Tan a Cot a

=>

4 Tan a / Tan a

= 4 = R.H.S

Answer 2

Answer:

Please see the attached explanation