- #1

- 110

- 4

- Homework Statement:
- I believed I've proved it right, but can someone confirm?

- Relevant Equations:
- n/a

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- Thread starter ttpp1124
- Start date

- #1

- 110

- 4

- Homework Statement:
- I believed I've proved it right, but can someone confirm?

- Relevant Equations:
- n/a

- #2

member 587159

$$(\tan^2 x -1)/\sec^2 x = (\tan^2 x -1) \cos^2 x = \sin^2 x - \cos^2 x = - \cos(2x)$$

so you could have been a little faster.

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