(3/8 +5/12)•24
1)3/8+5/12=9/24+10/24=19/24
2)24•24=576
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(8/11-3/22)•44
1)8/11-3/22=16/22-3/22=13/22
2)13/22•44=13/22•44/1=26
<span><span>1) 2⋅x⋅cos<span>(x)-</span>sin<span>(x)</span>⋅<span>(<span>x2</span>+1)
</span></span><span>2) <span>cos<span>(x)</span>⋅<span>(1−<span>x2</span>)</span>−4⋅x⋅sin<span>(x)
</span></span></span><span>3) <span>sin<span>(x)</span>⋅<span>(<span>x2</span>−5)</span>−6⋅x⋅cos<span>(x)
</span></span></span><span>4) <span>8⋅x⋅sin<span>(x)</span>+cos<span>(x)</span>⋅<span>(<span>x2</span>−11)
</span></span></span><span>5) <span>10⋅x⋅cos<span>(x)</span>+sin<span>(x)</span>⋅<span>(19−<span>x2</span>)
</span></span></span><span>6) <span>cos<span>(x)</span>⋅<span>(29−<span>x2</span>)</span>−12⋅x⋅sin<span>(x)
</span></span></span><span>7) <span>sin<span>(x)</span>⋅<span>(<span>x2</span>−41)</span>−14⋅x⋅cos<span>(x)
</span></span></span><span>8) <span><span>16⋅x⋅sin<span>(x)</span>+cos<span>(x)</span>⋅<span>(<span>x2</span>−55)</span></span></span></span></span>