- #1

timelyrainsun

- 2

- 0

## Homework Statement

I want to proove the determinant of the following 3x3 matrix is 0.

1 1 1

tanA tanB tanC

tan2A tan2B tan2C

where A+B+C=2pi.

## Homework Equations

Sorry I don't know how to type here so I show in the attachment.

## The Attempt at a Solution

Sorry I have attempted but found no way closed to the solution.

#### Attachments

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