Question

if sin²A=0,then find cosA​

Answer 1

Step-by-step explanation:

sin^2A+Cos^2A=1

0+Cos^2A=1

CosA=√1

CosA=1

Answer 2

Answer:

$sin {}^{2} = 1 - cos {}^{2}$

then

1 - cos 2 A = 0

Cos 2 A = 1

Cos A = 1