Question

Solve the attached sum (Trigonometry)

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Answer 1

Answer:
`\sec \theta`

Explanation:

The period of
`\sec \theta` is
`2\pi`, so
`\sec(4\pi -\theta)=\sec(-\theta)`

Also, as
`\sec \theta` is an even function,
`\sec(-\theta)=\boxed{\sec \theta}`