Question

if cosA+1/cosA=3, find the value of cos² A+1/cos² A​

Answer 1

Answer:

1

Step-by-step explanation:

let cos A = x

thus x +1/x = 3

Squaring both the sides

x² + 1/x² +2 x* 1/x =3

x² + 1/x² =3-2=1

Answer 2

answer is 5

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