book Maths Puzzle Numerical Ability

Simplify the following algebraic expression.

Simplify (-4 + x^2 +2x^3) - (-6 - x + 3x^3) - (-6y^3+ y^2)

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book Other Question

Find the range of y=_/9-x^2 dear : i want to solve this limt


limt ( sin x - tan x ) / x^3 at x tandes to 0