у=1-cosx
-1<=cos x<=1</p>
-1<=-cos x<=1</p>
0<=1-cos x<=2</p>
[0;2]
у=1-cos2x.
-1<=cos 2x<=1</p>
-1<=-cos 2x<=1</p>
0<=1-cos 2x<=2</p>
[0;2]
у=1/2 sinx cos x=1/4 sin 2x
-1<=sin2x<=1</p>
-1/4<=1/4sin2x<=1/4</p>
[-1/4;1/4]
найти область определения функции:4)у=tg 5x
5x не равно pi/2+pi*k
x не равно pi/10+pi\5*k
(pi\10+pi/5*k;3*pi/10*k+pi\5)