Question

if the value of sin A +sin² A=1,then find the value of cos² A+cos²A

Answer 1

Answer:

Step-by-step explanation:

sin A +sin² A=1

= sin A= 1-sin² A..................... equation 1

we know that cos²A = 1- sin²A (Because  of Identity)

hence cos ²A + cos²A= 2(Cos²A)= 2 ( 1-sin²a)

= 2- 2sin²a