cos(3п/2+a)/4cos(п+a)=sina/4(-cosa)=-1/4*tga
5cos15°cos105°=5cos15*cos(90+15)= - 2.5*2c0s15sin15=-2.5sin30=-2.5*0.5=-1.25
y=6+11cosx
cosxe[-1,1]
11cosxe[-11,11]
6+11cosxe[-5,17]
наименьшее -5
cos(3п/2+a)/4cos(п+a)=sina/4(-cosa)=-1/4*tga
5cos15°cos105°=5cos15*cos(90+15)= - 2.5*2c0s15sin15=-2.5sin30=-2.5*0.5=-1.25
y=6+11cosx
cosxe[-1,1]
11cosxe[-11,11]
6+11cosxe[-5,17]
наименьшее -5