(a-6)(a+6)+(3-a)(3+a)=а²-36+9-а²=-27
Решение
<span> y=3-cos2x-4sinx
y ` = 2sin2x - 4cosx
y ` = 0
</span><span>2sin2x - 4cosx = 0
</span>4sinx*cosx - 4cosx = 0
4cosx*(sinx - 1) = 0
1) cosx = 0
x₁ = π/2 + πk, k ∈ Z
2) sinx - 1 = 0
sinx = 1
x₂ = π/2 + 2πn, n ∈ Z
Ответ:
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Объяснение: