Question

All three identity of trigonometry...

Answer 1

¤ cos20+sin20=1
¤ 1+tan20=sec20
¤ 1+cot20=cosec20

Here 0= theta

Answer 2

1. Sin²θ+Cos²θ=1

2. 1+Tan²θ=Sec²θ

3. 1+Cot²θ=Cosec²θ

Hope it helps.....