1/4sin4a
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это же формулаsin2a=2sinacosa⇒sinacosa=1/2sin2a
Какое еще решение?????????!!!!!!!!!!!!
<span>а) y=5x-1</span>
<span> x+3y=5 </span>
<span>у=5х+1</span>
<span>х+15х-3=5</span>
<span>у=5х+1</span>
<span>16х=8</span>
<span>у=5х+1</span>
<span>х=0,5</span>
<span>у=2,5-1</span>
<span>у=1,5</span>
<span>Ответ: (0,5;1,5)</span>
<span>б) 4x+y=3/*2</span>
<span> 6x-2y=1</span>
<span> 8х+2у=6</span>
<span>+</span>
<span> <u>6х-2у=1</u></span>
14х=7
х=0,5
2+у=3
у=1
Ответ: (0,5;1)
Ставь лучшим!)))
5x+4=0
5x=-4
x= - 4/5
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3(3x-2)+2(7x-4)=10-5(3-4x)
9x-6+14x-8=10-15+20x
9x+14x-20x=10+6+8-15
3x=9
x=9/3
x=3
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