5.72^2 - 4.6 * 0.72 - 1.12 * 5.72 = 5.72^2 - 1.12 * 5.72 - 4.6 * 0.72 = 5.72*(5.72 - 1.12) = 5.72 * 4.6 - 4.6 * 0.72 = 4.6 * (5.72 - 0.72) = 4.6 * 5 = 23
Возрастающая минимум при -4 (-4+3))^3-1= -1-1=-2
максимум при -1 (-1+3)^3-1=8-1=7
Ответ:
Объяснение:
а) c6*c5=c6+5=c11;
б) (a4)3=a12;
в) 10ab+(a-5b)2=10ab+(a2-2*5ab+25b)=10ab-a2+10ab+25ab= -a2+25ab;
г) (b+3)2-(b+2)(b-2)-6b=(b2+2*3b+9)-(b2-4)-6b=b2+6b+9-b2-4-6b= -4
Найдите значения выражений sin2α , cos3α , если
а) α =π/12 ; б) α =π/6 ; в) α =π /2 ; г) α = 2π/3 .
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2α = a) π/6 ; б) α =π/3 ; в) α =π ; <span> г) </span>α = 4<span>π/3 </span>
3α = a) π/4 ; б) α =π/2 ; в) α =3π /2 ; г) α = 2π
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a) sin2α =sinπ/6 =1/2 ; cos3α =cosπ/4 =√2 /2 .
б) sin2α =sinπ/3 =√3 /2 ; cos3α =cos<span>π./2 =0 .
</span>в) sin2α =sinπ =0 ; cos3α =cos3π/2 =0
г) sin2α =sin4π/3 =sin(π+π/3) = -sinπ/3 = -√3 /2 ; <span>cos3α =cos2</span>π = 1.