Question

plz give proper answer ​

Answer 1

Step-by-step explanation:

out of syllabus so srry bro

Answer 2

Step-by-step explanation:

Sin(π/7) + Cos(π/7) = b

Sin(π/7)*Cos(π/7) = c

(b² - 2c)

{Sin(π/7) + Cos(π/7)}² - 2Sin(π/7)*Cos(π/7)

{ (a + b)² - 2ab = a² + b² }

Sin²(π/7) + Cos²(π/7)

= 1

I hope it will help you