169⁴*у⁸= (13²)⁴*у⁸ =13⁸*у⁸=(13у)⁸
169х⁴*у⁸ = 13²*х⁴*у⁸ =(13х²у⁴)²
#1. 4*sqrt(3)/2-sqrt(3)*sqrt(3)=2sqrt(3)-3
sqrt(6)*sqrt(2)/2*sqrt(3)/3=sqrt(36)/6=1
4*1/2-sqrt(3)*sqrt(3)=2-3=-1
cos5x*cos7x-sin5x*sin7x=√3/2
1)543•9=4887
152•6=912
4887+912=5799
5799÷15=386,6