Question

50sin129*cos129/sin258 (дробь)
Помогите, очень нужной

Answer 1

$frac{50*sin 129^{0}*cos 129^{0} }{sin258 ^{0} } = frac{25*2sin 129^{0}*cos 129^{0} }{sin 258^{0} } = frac{25*sin(2* 129^{0} )}{sin 258^{0} } = frac{25*sin 258^{0} }{sin 258^{0} } =25$