Let $$f(x) = a - {(x - 3)^{8/9}}$$, then maxima of $$f(x)$$ is

The approximate value of $$f(5.001)$$, where $$f(x)=x^3-7x^2+15$$ is

Find the maximum value of $$f(x) = {1 \over {4{x^2} + 2x + 1}}$$.

The point on the curve $$y^2=x$$, the tangent at which makes an angle 45$$^\circ$$ with X-axis is