Quick Overview

This question evaluates understanding of numerical methods, floating-point arithmetic, and algorithmic implementation in the Coding & Algorithms domain by requiring an approximation of the sine function under explicit error bounds.

Implement sin(x) with precision constraints

Company: Snapchat

Role: Software Engineer

Category: Coding & Algorithms

Difficulty: medium

Interview Round: Technical Screen

## Coding Question: Implement `sin(x)` Implement a function that returns an approximation of the trigonometric sine function. ### Function signature - Input: a real number `x` (in radians) - Output: `sin(x)` as a floating-point number ### Restrictions - Do **not** call library trig functions (e.g., `sin`, `cos`, `tan`). - You may use basic arithmetic operations and constants. ### Accuracy requirement - Your result must satisfy: \(|\text{ans} - \sin(x)| \le \varepsilon\) - Assume the interviewer provides a specific `ε` (e.g., `1e-6`). ### Follow-ups 1. After writing a straightforward version, describe how you would **optimize** it (time and/or numerical stability). 2. In real systems, how would you further **engineer** this function for performance and reliability (e.g., handling large `|x|`, speed, testing, edge cases)? ### Notes - You may assume IEEE-754 `double` behavior. - Consider how your implementation behaves for very large magnitude `x` and near special points (e.g., around `0`, `π`, `π/2`).

Overview: This question evaluates understanding of numerical methods, floating-point arithmetic, and algorithmic implementation in the Coding & Algorithms domain by requiring an approximation of the sine function under explicit error bounds.

Read the full Snapchat Software Engineer interview experience this question came from

Approximate sine without calling library trig functions, using range reduction and a Taylor series.

Constraints

  • Do not call math.sin/cos/tan

Examples

Input: (0.0, 1e-08)

Expected Output: 0.0

Explanation: sin(0).

Input: (1.5707963267948966, 1e-08)

Expected Output: 1.0

Explanation: Near pi/2.

Hints

  1. Reduce x to [-pi, pi], then evaluate the alternating Taylor series.

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