2 pí rad= 360 graducov
180 graducov = pí rad
Log12(1/2*1/72)=log12(1/144)=log12(12^-2)
<span>7(sin^2*11 - cos^2*11)/cos22
т.к. сos2</span>α= cos²α-sin²α, то
7(sin²11-cos²11)/cos22=-7(cos²11-sin²11)/cos22=-7cos22/<span>cos22=-7
</span>
вот и все <span>объяснения...</span>
28-24x=-9x+5
-15x=-23
X=23/15=1,53