tan2a=-sinasin2a/cos2a=-sina2cosa/cos2a=-1cos2a/cosa=-22cosa-1/cosa=-22cosa^2-1+2cosa=0(cosa-1)^2=1/2+1/4cosa=1-√3/2 cosa^2=7/4-√3 sina^2=1-(7/4-√3)=√3-3/4tana^2=sina^2/cosa^2=(4√3-3)/(7-4√3)=(4...