Question

If sin square A=0 then the value of cosA is

Answer 1

cos A = +1 or -1

Step-by-step explanation:

Given :

${sin}^{2} A \: = 0$

To find :

The value of cos A.

Solution :

${cos}^{2} A \: = 1 - {sin}^{2} A \\ \therefore \: {cos}^{2} A \: = 1 - 0 \: = 1 \\ \therefore \: cos \: A = + - \sqrt{1} \\ = + 1 \: \: or \: \: - 1$

Hence, the answer.