1. f(x)=x+cos2x
F(x)=0,5x²+0,5sin2x+C
f(x)=4x+7
F(x)=2x²+7x+C
2. f(x)=1-x²
F(x)=x-x³/3 +C
F(-3)=-3-(-3)³/3 +C
-3-(-3)³/3 +C= 9
-3+27/3 +C= 9
-3+9 +C= 9
C=3
F(x)=x-x³/3 +3
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Verified answer
1. f(x)=x+cos2x
F(x)=0,5x²+0,5sin2x+C
f(x)=4x+7
F(x)=2x²+7x+C
2. f(x)=1-x²
F(x)=x-x³/3 +C
F(-3)=-3-(-3)³/3 +C
-3-(-3)³/3 +C= 9
-3+27/3 +C= 9
-3+9 +C= 9
C=3
F(x)=x-x³/3 +3