Question

5синус 74 / косинус 37*косинус 53

Answer 1

53=90-37
74=37*2

Значит, cos(53) = cos(90-37) = sin(37)
sin(74) = sin(2*37) = 2sin(37)cos(37)

$frac{5sin74}{cos37*cos53} = frac{10*sin37*cos37}{cos37*sin37} = 10$