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Answer:
Hi,
Explanation:
1)
y''=7 cos(x)
=> y'= 7 sin(x)+C
=> y=-7 cos(x)+Cx+D
y'(0)=9 => 9=7*0+C => C=9
y(0)=-9 => -9=-7*1+9*0+D => D=-2
y= 7 cos(x) +9x -2
2)
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