Question

(1 - sin A) (1 +sin A)=​

Answer 1

Step-by-step explanation:

(1-sin²A)

=cos²A

therefore cos²A is your answer

Answer 2

Answer:

cos²A

Step-by-step explanation:

(1-sin A)(1+sin A)=((1)²-(SinA)²

=1 - Sin²A

we know that, Sin²A + cos²A=1

taking Sin²A to RHS

1 - Sin²A= Cos²A

therefore, (1 - SinA)(1 + SinA)= Cos²A