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Domain of the function f(x)=`sin^(- 1)(1+3x+2x^2)` |
Answer» `f(x) = sin^(-1)(1+3x+2x^(2))` We must have ` -1 le 1 +3x +2x^(2) le 1` Now `2x^(2)+3x +1 ge -1` `implies 2x^(2)+3x +2 ge 0`, which is always true as discriminant ` le 0`. Also, `2x^(2) +3x +1 le 1` `implies 2x^(2) +3x le 0` `implies x(2x+3) le 0` `implies (-3)/(2) le x le 0` `implies x in [-(3)/(2),0]` |
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