Question

Вычисли:..................................

Answer 1

$2 frac{ sin(60) }{ tan(30) } - cos(45) sin(45) + 3 tan(60) cos(30) = 2 times frac{ frac{ sqrt{3} }{2} }{ frac{ sqrt{3} }{3} } - frac{ sqrt{2} }{2} times frac{ sqrt{2} }{2} + 3 times sqrt{3} times frac{ sqrt{3} }{2} = 2 times frac{ sqrt{3} }{2 } times frac{3}{ sqrt{3} } - frac{2}{4} + frac{9}{2} = 3 - frac{1}{2} + frac{9}{2} = frac{6 - 1 + 9}{2} = frac{14}{2} = 7$

Answer 2

пасибо!