Trigonometry - Compound and Double-Angle Identities

The straight line with equation \(y = \frac{3}{4}x\) makes an acute angle \(\theta\) with the \(x\)-axis.

1. Write down the value of \(\tan{\theta}\).
2. Find the value of
   1. \(\sin{2\theta}\)
   2. \(\cos{2\theta}\)