1. В
2. sin^4a+sin^2acos^2a=sin^2a(sin^2a+cos^2a)=sin^2a*1=sin^2a
3. sin52cos38+cos52sin38=sin(52+38)=sin90=1
Is Daddy in the kitchen? Chuckles is behind the tree.There are two chairs in the living room. He is in the bedroom.
1) = cosx*(cosx-1)+sinx*(-sinx)= cos^2 x-cosx- sin^2 x= cos2x-cosx
2) = 2x*ctgx - x^2/sin^2 x
3) = -sinx*(1+sinx) + cosx*cosx= -sinx - sin^2 x + cos^2 x= cos2x - sinx
4) = 2x*tgx+ x^2/cos^2 x
<span>y=|x|(x+1)-6x</span>
x≥0 y=x²-5x
x<0 y=-x²-7x