а) cos x < √3/2x < 30⁰, т.к. cos 30⁰ = √3/2b) sin 3x > - √2/23x > - √2/2x > 75⁰c) sin ( x/4 + x/3 ) <= √3/2( x/4 + x/3 ) <= 60⁰
а) cos x < √3/2
x < 30⁰, т.к. cos 30⁰ = √3/2
b) sin 3x > - √2/2
3x > - √2/2
x > 75⁰
c) sin ( x/4 + x/3 ) <= √3/2
( x/4 + x/3 ) <= 60⁰