Question

sin^2 theta =1/2 find the value of cos^2 theta​

Answer 1

sin²Q = 1/2

sin²Q +cos²Q = 1

put value

1/2+cos²Q = 1

cos²Q = 1-1/2 = (2-1)/2 = 1/2

hope it's helpful you

Answer 2

$sin {}^{2} \alpha + cos { \alpha }^{2} = 1$
$1 \div 2 + cos { \alpha }^{2} = 1 \\ cos {}^{2} \alpha = 1 - 1 \div 2 \\ cos { }^{2} \alpha = 2 - 1 \div 2 \\ cos {}^{2}\alpha = 1 \div 2$