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<span>а)(1+3m)(1-3m)=1-9m^2</span>
<span><span>в)(2x-y)(2x+y)=4x^2-y</span></span>
<span><span><span>д)(4x+3y)(3y-4x)=-(4x+3y)(4x-3y)=-16x^2+9y^2</span></span></span>
<span><span><span><span>номер2</span></span></span></span>
<span><span><span><span><span>а)(x(^2)+2)(x(^2)-2)=x^4-4</span></span></span></span></span>
<span><span><span><span><span><span>в)(a(^2)-4)(a(^2)+4)=a^4-16</span></span></span></span></span></span>
<span><span><span><span><span><span><span>д)(ab-c)(ab+c)=a^2b^2-c^2</span></span></span></span></span></span></span>
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Первый номер:
2sinLcosL-sin^2L-2sinLcosL-cos^2L=-sin^2L-cos^2L
X≥a U x≥-4
x-a=x²+8x+16
x2+7x+16-a=0
D=49-64+4a=4a-15=0
4a=15
a=3,75