Question

Cos^4A - Sin^4A is equals to​

Answer 1

Answer:

Cos²A - Sin²A

Step-by-step explanation:

cos∧4A -Sin∧4A = (Cos²A - Sin²A)(Cos²A+Sin²A)

                           = Cos²A - Sin²A

Answer 2

Step-by-step explanation:

cos^A-sin^4A=(cos^2 a) ^2 -(sin^2 a) ^2

(cos^2 a+ sin^2 a) (cos^2 A-sin^2 a)

1(cos^2 a-sin^2a)

1-sin^2a-sin^2 A=1-2 sin^2 A

cos^2 a -(1- cos^2A)

2 cos^2 A-1

cos^4-sin^4A

cos^2A sin^2A

1-2sin^2A

2 cos^2 A-1