Ex. 1

5^2

Ex. 2

5^{-1}

Ex. 3

\frac{3}{4}

Ex.4

\frac{5^2}{3^3}

Ex. 5

\tan\theta=\frac{9}{12}

Ex. 6

\sin30^\circ=\frac{x}{2}

Ex. 7

x=cos^{-1}(\frac{3/4})