-x^2 <or equal to cos20pix<or equal to x^2
lim -x^2=0 -1<or equal to cospix<or equal to 1
lim x^2(cospix) =0.
Can someone check this and see if I did this right?
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The working is right, but please be careful, because on the second line you dropped x^2 and by the end you had dropped the 20.
Thanks! I'll be more careful, I didn't even realize I left those out.
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