Question

if sin theta is 5 by 13 then find the value of cos 2 theta.
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Answer 1

130                                                                                                                                        IS MY ANSWER CORRECT PLEASE MAKE ME THE BRAINLIEST

Answer 2

Answer:

119/169

Step-by-step explanation:

sin

$\sin( \alpha ) = 5 \div 13 \: then \: cos \alpha = 12 \div 13 \: so\: cos2 \alpha = 1 - 2 \sin {}^{2} \alpha \: so \: \: \cos(2 \alpha ) = 1 - 2 .\: 5 ^{2} \div 13 ^{2} = 1 - 50 \div 169 = 169 - 50 \div 169 = 119 \div 169$