Question

if sec A= 5/4 prove that Cos^2 A=1-sin^2 A​

Answer 1

Answer:

cos²A + sin²A is always one

Step-by-step explanation:

cos²A = b²/h²

sin²A= p²/h²

now we get

p²+b²/h². (p²+b²=h²)

then h²/h²

so answer is 1

Answer 2

Step-by-step explanation:

1-sin²A=sin²+cos²A-sin²A

=cos²A(proved)