9. x², Let f(x)=sin(x), x < 0 0≤x<π/2 x-π/2, x≥π/2 (a) Graph f. Your graph should be accurate with appropriate tick marks. (b) Is f continuous at x = 0? Explain your answer using limit notation. (c) Is f continuous at x = π/2? Explain your answer using limit notation.

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