## Math Problem Statement

## Solution

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## Math Problem Analysis

### Mathematical Concepts

Calculus

Concavity

Second Derivative

Trigonometric Functions

### Formulas

First Derivative: y' = 3 - 7sec^2(x)

Second Derivative: y'' = -14sec^2(x)tan(x)

### Theorems

Concavity Test: A function is concave upward where y'' > 0, and concave downward where y'' < 0.

### Suitable Grade Level

Grades 11-12 (or first-year college calculus)

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