1)4m2/m4
2)a4/3b3
3)1/(a-b)3
4)1/(a+b)2
P=a+b+c
P=48см
48-18=30см(две другие стороны)
30-10=20(1 сторона)
20-10=10(2 сторона)
1=18см
2=10см
3=20см
18+10+20=48
(tgt+ctgt)²-(tgt-ctgt)²=tg²t+2tgt*ctgt+ctg²-(tg²t-2tgt*ctgt+ctg²t)=2tgt*ctgt=4*1=4
sin2tcos2t*(tgt+ctgt+2)=1+sin4t
1. tg2t+ctg2t=sin2t/cos2t+cos2t/sin2t=(sin²2t+cos²2t)/(sin2t*cos2t)=1/(sin2t*cos2t)
2. sin2t*cos2t*(1/sin2t*cos2t+2)=sin2t*cos2t*(1+2sin2t*cos2t)/(sin2t*cos2t)=1+sin4t
1) 0,25=1/4; (1/4)^7*(1/4)^3=(1/4)^10, 64=16*4=4*4*4=4^3.
2) 0,0001=(0,1)^4*(0,1)^5=(0,1)^9, 0,0001=1/10 000=1/10^4=(1/10)^4
=(0,1)^4.