Since `1lexle3` or `1lex^(2)le9` or `4lex^(2)+3le12` or `2lesqrt(3+x^(2))le2sqrt(3)` or `2(3-1)leint_(1)^(3)sqrt(3+x^(2))dx le 2sqrt(3)(3-1)` or `4le int_(1)^(3)sqrt(3+x^(2))le 4 sqrt(3)`
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