Question

Помогите пожалуйста сделать!!!!

Answer 1

$1)\frac{10}{\sqrt{3} }Sin\frac{\pi }{3}+8Cos\frac{\pi }{2}+3\sqrt{2}Cos\frac{\pi }{4}+5tg\frac{3\pi }{4}=\frac{10}{\sqrt{3} }*\frac{\sqrt{3}}{2} +8*0+3\sqrt{2}*\frac{1}{\sqrt{2}}+5*(-1)=\\\\=5+0+3-5=\boxed3$

$2)1-Sin^{2}3\alpha-Cos^{2}3\alpha=1-\underbrace{(Sin^{2}3\alpha+Cos^{2}3\alpha)}_{1}= 1-1=\boxed0\\\\\\3)-18\sqrt{2}Sin(-135^{0})=-18\sqrt{2}*(-Sin(180^{0} -45^{0}))=18\sqrt{2}*Sin45^{0}=\\\\=18\sqrt{2}*\frac{1}{\sqrt{2} }=\boxed{18}$