Question

вычислите 9 кл
$a) sin58 ^{o} cos13^{o} - cos58^{o} sin13 ^{o} = \ b) cos frac{pi}{12} cos frac{7pi}{12} - sinfrac{pi}{12} sin frac{7pi}{12 } =$

Answer 1

а)sin(45°)=√2/2............